| Intangible Assets |
6.Intangible Assets
Intangible assets consist of the following:
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June 30, 2014
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December 31, 2013
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Gross
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Net
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Gross
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Net
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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 - 12 years
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$
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42,403
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$
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(17,665
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)
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$
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24,738
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$
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42,103
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$
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(14,593
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)
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$
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27,510
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Proprietary technologies
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1.5 - 8 years
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9,978
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(4,482
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)
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5,496
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9,580
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(2,792
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)
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6,788
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Trade names
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5 years
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2,090
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(926
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)
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1,164
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2,090
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(690
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)
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1,400
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Total intangible assets
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$
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54,471
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$
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(23,073
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)
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$
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31,398
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$
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53,773
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$
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(18,075
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)
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$
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35,698
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Amortization expense was as follows:
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Three Months Ended
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Six Months Ended
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June 30,
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June 30,
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2014
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2013
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2014
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2013
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Amortization expense
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$
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2,554
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$
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1,568
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$
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4,998
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$
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3,152
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