Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the fiscal years ended December 31 were as follows:

	2017		2016
Balance as of January 1	$	683,683	$	687,404
Goodwill resulting from the Trade NTE business combination		—		191
Goodwill resulting from the Mostra business combination		—		654
Goodwill resulting from the Olson business combination		—		267
Effect of foreign currency translation		2,425		(4,833	)
Total goodwill	$	686,108	$	683,683

Schedule of Other Intangibles

Other intangibles consisted of the following at December 31:    

	2017
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer-related	$	84,878	$	(49,782	)	$	35,096
Developed technology		1,463		(1,350	)		113
Total amortizable intangible assets		86,341		(51,132	)		35,209
Intangible with indefinite life		95		—			95
Total other intangible assets	$	86,436	$	(51,132	)	$	35,304

	2016
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer-related	$	115,806	$	(70,090	)	$	45,716
Developed technology		1,463		(1,145	)		318
Total amortizable intangible assets		117,269		(71,235	)		46,034
Intangible with indefinite life		95		—			95
Total other intangible assets	$	117,364	$	(71,235	)	$	46,129

Schedule of Estimated Future Amortization Expense Relating to Intangible Assets

The estimated future amortization expense relating to intangible assets is as follows:

Year ending December 31,
2018	$	8,441
2019		6,132
2020		4,532
2021		4,082
2022		4,125
Thereafter		7,897
Total	$	35,209