Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	[1]	Mar. 31, 2017
Income Statement [Abstract]
Revenues, net	$ 585,500		$ 520,433
Expenses:
Merchant commissions	0		24,384
Processing	116,485		101,824
Selling	47,111		38,837
General and administrative	90,315		95,454
Depreciation and amortization	71,502		64,866
Operating income	260,087		195,068
Investment loss	0	[2]	2,377
Other (income) expense, net	(297)		2,196
Interest expense, net	31,065		23,127
Total other expense	30,768		27,700
Income before income taxes	229,319		167,368
Provision for income taxes	54,382		43,675
Net income	$ 174,937	[2]	$ 123,693
Earnings per share:
Basic earnings per share (in dollars per share)	$ 1.95		$ 1.34
Diluted earnings per share (in dollars per share)	$ 1.88		$ 1.31
Weighted average shares outstanding:
Basic weighted average shares outstanding (in shares)	89,765		92,108
Diluted weighted average shares outstanding (in shares)	93,250		94,560

[1] Reflects the January 1, 2018 adoption of Accounting Standards Update 2014-09, "Revenue from Contracts with Customers (Topic 606)" using the modified retrospective transition method. As a result of the application of the modified retrospective transition method, the Company's prior period results within its annual report on Form 10-K and quarterly reports on Form 10-Q will not be restated to reflect the impact of Topic 606. See footnote 1.

[2] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-18, Statement of Cash Flows (Topic 230), which was adopted by the Company on January 1, 2018 and applied retrospectively to results for 2017. The adoption of Topic 230 resulted in the statement of cash flows presenting the changes in the total of cash, cash equivalents and restricted cash. As a result, the Company will no longer present transfers between cash and cash equivalents and restricted cash in the consolidated statement of cash flows.