Software and Other Intangible Assets - Summary of Carrying Amount and Accumulated Amortization of Software Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 538,888	$ 389,470
Accumulated Amortization	(304,371)	(252,242)
Net Balance	234,517	137,228
Software for resale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	138,823	137,666
Accumulated Amortization	(122,061)	(110,124)
Net Balance	16,762	27,542
Software amortization expense	11,000	12,800	$ 12,800
Software for internal use
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	400,065	251,804
Accumulated Amortization	(182,310)	(142,118)
Net Balance	217,755	109,686
Software amortization expense	$ 55,600	$ 41,700	$ 45,200