| Intangible Assets |
6.Intangible Assets
Intangible assets consist of the following:
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March 31, 2015
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December 31, 2014
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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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68,603
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$
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(24,015
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)
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$
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44,588
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$
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68,603
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$
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(21,699
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)
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$
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46,904
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Proprietary technologies
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1.5 - 8 years
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18,671
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(6,458
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)
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12,213
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15,678
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(5,808
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)
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9,870
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Trade names
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5 years
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3,090
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(1,377
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)
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1,713
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3,090
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(1,210
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)
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1,880
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Total intangible assets
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$
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90,364
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$
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(31,850
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)
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$
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58,514
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$
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87,371
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$
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(28,717
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)
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$
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58,654
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Amortization expense was as follows:
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Three Months Ended
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March 31,
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2015
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2014
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Amortization expense
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$
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3,133
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$
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2,444
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