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Goodwill and Identifiable Assets | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Identifiable Intangible Assets | Goodwill and Other Identifiable Intangible Assets The changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2015 are as follows (in thousands):
| Apex |  | Oxford |  | Total
Balance as of December 31, 2014 | $ | 287,951 |  |  | $ | 224,109 |  |  | $ | 512,060 |
Creative Circle Acquisition | 358,029 |  |  | — |  |  | 358,029 |
LabResource Acquisition | — |  |  | 6,449 |  |  | 6,449 |
Translation adjustment | (1,363 | ) |  | (269 | ) |  | (1,632 | )
Balance as of December 31, 2015 | $ | 644,617 |  |  | $ | 230,289 |  |  | $ | 874,906 |
Translation adjustment | — |  |  | (1,393 | ) |  | (1,393 | )
Balance as of December 31, 2016 | $ | 644,617 |  |  | $ | 228,896 |  |  | $ | 873,513 |
As of December 31, 2016 and 2015, the Company had the following acquired intangible assets (in thousands):
|  |  |  | 2016 |  | 2015
|  | Estimated Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | 2 - 10 years |  | $ | 196,204 |  |  | $ | 98,804 |  |  | $ | 97,400 |  |  | $ | 196,472 |  |  | $ | 74,640 |  |  | $ | 121,832 |
Contractor relationships |  | 2 - 5 years |  | 69,721 |  |  | 50,528 |  |  | 19,193 |  |  | 69,764 |  |  | 40,124 |  |  | 29,640 |
Non-compete agreements |  | 2 - 7 years |  | 10,861 |  |  | 4,922 |  |  | 5,939 |  |  | 10,874 |  |  | 3,163 |  |  | 7,711 |
In-use software |  | 6 years |  | 18,900 |  |  | 9,666 |  |  | 9,234 |  |  | 18,900 |  |  | 6,516 |  |  | 12,384 |
Favorable contracts |  | 5 years |  | 900 |  |  | 453 |  |  | 447 |  |  | 900 |  |  | 172 |  |  | 728 |
|  |  |  | 296,586 |  |  | 164,373 |  |  | 132,213 |  |  | 296,910 |  |  | 124,615 |  |  | 172,295 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  |  | 245,517 |  |  | — |  |  | 245,517 |  |  | 245,630 |  |  | — |  |  | 245,630 |
Total |  |  |  | $ | 542,103 |  |  | $ | 164,373 |  |  | $ | 377,730 |  |  | $ | 542,540 |  |  | $ | 124,615 |  |  | $ | 417,925 |
Amortization expense for intangible assets with finite lives wa s $39.6 million i n 2016, $34.5 million in 2015 and $22.1 million in 2014. Estimated amortization for each of the next five years and thereafter follows (in thousands):
2017 | $ | 32,982 |
2018 | 28,859 |
2019 | 21,976 |
2020 | 14,468 |
2021 | 11,759 |
Thereafter | 22,169 |
| $ | 132,213 |

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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