Software and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying Amount and Accumulated Amortization of Other Intangible Assets

The carrying amount and accumulated amortization of the Company’s other intangible assets that were subject to amortization at each balance sheet date are as follows (in thousands):

	December 31, 2017							December 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net Balance		Gross Carrying Amount		Accumulated Amortization			Net Balance
Customer relationships	$	305,218	$	(116,677	)	$	188,541	$	295,730	$	(96,356	)	$	199,374
Trademarks and tradenames		16,646		(13,906	)		2,740		16,019		(11,759	)		4,260
	$321,864		$(130,583)			$191,281		$311,749		$(108,115)			$203,634

Estimated Amortization Expense for Future Fiscal Years Based on Capitalized Software and Other Intangible Assets

Based on capitalized intangible assets at December 31, 2017, and assuming no impairment of these intangible assets, estimated amortization expense amounts in future fiscal years are as follows (in thousands):

Fiscal Year Ending December 31,	Software Amortization		Other Intangible Assets Amortization
2018	$	49,012	$	19,145
2019		40,471		18,587
2020		31,550		17,688
2021		19,734		17,176
2022		8,383		17,015
Thereafter		6,236		101,670
Total	$	155,386	$	191,281