Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	[1]	Dec. 31, 2018	Dec. 31, 2017	[2]
Income Statement [Abstract]
Revenues, net	$ 2,648,848		$ 2,433,492	$ 2,249,538
Expenses:
Merchant commissions	0		0	113,133
Processing	530,669		487,695	429,613
Selling	204,806		182,593	170,717
General and administrative	407,210		389,172	387,694
Depreciation and amortization	274,210		274,609	264,560
Other operating expense, net	523		8,725	61
Operating income	1,231,430		1,090,698	883,760
Investment loss, net	3,470	[3]	7,147	53,164	[4]
Other expense (income), net	93		(152,166)	(173,436)
Interest expense, net	150,048		138,494	107,146
Loss on extinguishment of debt	0	[3]	2,098	3,296	[4]
Total other expense (income)	153,611		(4,427)	(9,830)
Income before income taxes	1,077,819		1,095,125	893,590
Provision for income taxes	182,746		283,642	153,390
Net income	$ 895,073	[3]	$ 811,483	$ 740,200	[4]
Earnings per share:
Basic earnings per share (in usd per share)	$ 10.36		$ 9.14	$ 8.12
Diluted earnings per share (in usd per share)	$ 9.94		$ 8.81	$ 7.91
Weighted average shares outstanding:
Basic (in shares)	86,401		88,750	91,129
Diluted (in shares)	90,070		92,151	93,594

[1] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019, using a modified retrospective transition method. Under this method, financial results reported in periods prior to 2019 are unchanged. Refer to footnote 14.

[2] The Company applied the modified retrospective transition method when adopting ASC 606, therefore the Company's 2017 prior period results were not restated to reflect ASC 606.

[3] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019 using the modified retrospective transition method. The adoption of the Leases guidance resulted in an adjustment to other assets, other current liabilities and other noncurrent liabilities in our consolidated balance sheet for the cumulative effect of applying the standard. Financial results reported in periods prior to 2019 are unchanged.

[4] 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 statement of cash flows.