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Goodwill and Identifiable Assets (Notes) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Identifiable Intangible Assets | 5. Goodwill and Identifiable Intangible Assets The changes in the carrying amount of goodwill for the nine months ended September 30, 2018 and the year ended December 31, 2017 were as follows (in thousands):
| Apex Segment |  | Oxford Segment |  | ECS Segment |  | Total
Balance as of December 31, 2016 | $ | 644,617 |  |  | $ | 228,896 |  |  | $ | — |  |  | $ | 873,513 |
Stratacuity acquisition | 17,467 |  |  | — |  |  | — |  |  | 17,467 |
Translation adjustment | — |  |  | 3,115 |  |  | — |  |  | 3,115 |
Balance as of December 31, 2017 | 662,084 |  |  | 232,011 |  |  | — |  |  | 894,095 |
ECS acquisition | — |  |  | — |  |  | 527,388 |  |  | 527,388 |
Translation adjustment | — |  |  | (847 | ) |  | — |  |  | (847 | )
Balance as of September 30, 2018 | $ | 662,084 |  |  | $ | 231,164 |  |  | $ | 527,388 |  |  | $ | 1,420,636 |
Acquired intangible assets consisted of the following (in thousands):
|  |  | September 30, 2018 |  | December 31, 2017
| Estimated Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer and contractual relationships | 2 - 13 years |  | $ | 343,707 |  |  | $ | 135,739 |  |  | $ | 207,968 |  |  | $ | 202,588 |  |  | $ | 119,272 |  |  | $ | 83,316 |
Contractor relationships | 2 - 5 years |  | 71,121 |  |  | 65,102 |  |  | 6,019 |  |  | 71,121 |  |  | 59,174 |  |  | 11,947 |
Backlog | 1 year |  | 26,100 |  |  | 17,400 |  |  | 8,700 |  |  | — |  |  | — |  |  | — |
Non-compete agreements | 2 - 7 years |  | 22,234 |  |  | 8,950 |  |  | 13,284 |  |  | 11,850 |  |  | 6,600 |  |  | 5,250 |
In-use software | 6 years |  | 18,900 |  |  | 15,178 |  |  | 3,722 |  |  | 18,900 |  |  | 12,816 |  |  | 6,084 |
Favorable contracts | 5 years |  | 1,400 |  |  | 804 |  |  | 596 |  |  | 900 |  |  | 673 |  |  | 227 |
|  |  | 483,462 |  |  | 243,173 |  |  | 240,289 |  |  | 305,359 |  |  | 198,535 |  |  | 106,824 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 262,268 |  |  | — |  |  | 262,268 |  |  | 245,942 |  |  | — |  |  | 245,942 |
Total |  |  | $ | 745,730 |  |  | $ | 243,173 |  |  | $ | 502,557 |  |  | $ | 551,301 |  |  | $ | 198,535 |  |  | $ | 352,766 |
Estimated future amortization expense is as follows (in thousands):
Remainder of 2018 | $ | 18,545 |
2019 | 51,296 |
2020 | 40,287 |
2021 | 35,469 |
2022 | 24,437 |
Thereafter | 70,255 |
| $ | 240,289 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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