| INTANGIBLE ASSETS |
NOTE 7—INTANGIBLE ASSETS
The carrying amount of intangible assets, net of accumulated amortization and impairment charges, as of December 31, 2015 and 2014 consisted of the following:
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2015
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Gross
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Carrying
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Accumulated
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Currency
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Net Book
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Amount
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Acquisitions
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Amortization
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impact
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Value
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Amortizable intangibles:
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Customer relationships
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$
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53,466
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$
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984
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$
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(41,893)
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$
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(159)
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$
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12,398
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Noncompete agreements
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5,665
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5
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(5,663)
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—
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7
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Software
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1,583
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—
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(1,501)
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(49)
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33
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Backlog
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5,002
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—
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(4,975)
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(27)
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—
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Databases
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5,444
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—
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(4,420)
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(108)
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916
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Trademark and trade names
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1,250
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—
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(744)
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—
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506
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Intangibles
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$
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72,410
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$
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989
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$
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(59,196)
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$
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(343)
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$
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13,860
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2014
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Gross
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Carrying
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Accumulated
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Currency
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Net Book
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Amount
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Acquisitions
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Amortization
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impact
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Value
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Amortizable intangibles:
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Customer relationships
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$
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52,140
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$
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1,326
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$
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(37,091)
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$
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(108)
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$
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16,267
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Noncompete agreements
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5,665
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—
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(5,633)
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—
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32
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Software
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1,500
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83
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(1,502)
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(18)
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63
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Backlog
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4,880
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122
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(4,971)
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(14)
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17
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Databases
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4,949
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495
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(4,111)
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(62)
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1,271
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Trademark and trade names
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1,250
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—
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(565)
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—
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685
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Intangibles
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$
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70,384
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$
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2,026
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$
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(53,873)
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$
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(202)
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$
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18,335
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Amortization expense was $5.3 million, $5.6 million and $5.8 million for the years ended December 31, 2015, 2014 and 2013, respectively. The estimated future amortization expense subsequent to December 31, 2015, is as follows:
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2016
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$
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4,839
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2017
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4,469
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2018
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1,296
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2019
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1,089
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2020
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1,069
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Thereafter
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1,098
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$
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13,860
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