Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019		Mar. 31, 2018
Income Statement [Abstract]
Revenues, net	$ 621,825		$ 585,500
Expenses:
Processing	129,114		116,485
Selling	49,261		47,111
General and administrative	92,784		90,370
Depreciation and amortization	67,445		71,502
Other operating, net	(955)		(55)
Operating income	284,176		260,087
Investment loss	15,660	[1]	0
Other expense (income), net	220		(297)
Interest expense, net	39,055		31,065
Total other expense	54,935		30,768
Income before income taxes	229,241		229,319
Provision for income taxes	57,134		54,382
Net income	$ 172,107	[1]	$ 174,937
Earnings per share:
Basic earnings per share (in dollars per share)	$ 2.00		$ 1.95
Diluted earnings per share (in dollars per share)	$ 1.93		$ 1.88
Weighted average shares outstanding:
Basic (in shares)	85,941		89,765
Diluted (in shares)	89,244		93,250

[1] 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.