Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	[1]
Income Statement [Abstract]
Revenues, net	$ 520,433	$ 414,262
Expenses:
Merchant commissions	24,384	28,233
Processing	101,824	79,814
Selling	38,837	26,553
General and administrative	95,434	67,594
Depreciation and amortization	64,866	36,328
Other operating, net	20	(215)
Operating income	195,068	175,955
Equity method investment loss	2,377	2,193
Other expense, net	2,196	659
Interest expense, net	23,127	16,191
Total other expense	27,700	19,043
Income before income taxes	167,368	156,912
Provision for income taxes	43,675	45,822
Net income	$ 123,693	$ 111,090
Earnings per share:
Basic earnings per share (in dollars per share)	$ 1.34	$ 1.20
Diluted earnings per share (in dollars per share)	$ 1.31	$ 1.17
Weighted average shares outstanding:
Basic weighted average shares outstanding (in shares)	92,108	92,516
Diluted weighted average shares outstanding (in shares)	94,560	95,030

[1] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, to simplify several aspects of the accounting for share-based compensation, including the income tax consequences.