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Goodwill and Identifiable Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

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

Schedule of Acquired Intangible Assets

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

Schedule of Estimated Future Amortization Expense

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