| Schedule of components of intangible assets, net |
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June 30, 2017
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December 31, 2016
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Gross
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Net
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Gross
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Net
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Estimated
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Carrying
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Accumulated
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Carrying
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Carrying
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Accumulated
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Carrying
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Useful Life
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Amount
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Amortization
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Amount
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Amount
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Amortization
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Amount
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Customer lists
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4
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-
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15
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years
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$
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259,350
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$
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(66,820)
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$
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192,530
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$
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259,490
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$
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(54,861)
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$
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204,629
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Proprietary technologies
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2
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-
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8
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years
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57,328
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(25,419)
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31,909
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57,770
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(20,214)
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37,556
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Trade names
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2
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-
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7
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years
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24,889
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(7,905)
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16,984
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25,007
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(6,178)
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18,829
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Backlog
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4
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years
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11,000
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(8,521)
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2,479
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11,000
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(6,456)
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4,544
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Total intangible assets
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$
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352,567
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$
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(108,665)
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$
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243,902
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$
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353,267
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$
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(87,709)
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$
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265,558
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| Schedule of future amortization expense of the intangible assets |
Future amortization expense of the intangible assets as of June 30, 2017, is expected to be as follows:
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Years ending December 31:
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Remainder of 2017
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$
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20,645
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2018
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35,691
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2019
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32,092
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2020
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28,368
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2021
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20,678
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Thereafter
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106,428
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$
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243,902
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