Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues, net	$ 525,146	$ 647,094	$ 1,186,239	$ 1,268,919
Expenses:
Processing	121,290	120,458	354,993	249,572
Selling	42,374	51,856	98,233	101,117
General and administrative	86,739	106,784	192,849	199,568
Depreciation and amortization	62,162	70,908	126,638	138,353
Other operating, net	(230)	(229)	(268)	(1,184)
Operating income	212,811	297,317	413,794	581,493
Investment (gain) loss	(33,709)	0	(31,338)	15,660
Other expense (income), net	2,480	528	(6,886)	748
Interest expense, net	32,412	39,529	68,091	78,584
Total other expense	1,183	40,057	29,867	94,992
Income before income taxes	211,628	257,260	383,927	486,501
Provision for (benefit from) income taxes	53,140	(4,391)	78,379	52,743
Net income	$ 158,488	$ 261,651	$ 305,548	$ 433,758
Earnings per share:
Basic earnings per share (in dollars per share)	$ 1.89	$ 3.03	$ 3.62	$ 5.03
Diluted earnings per share (in dollars per share)	$ 1.83	$ 2.90	$ 3.50	$ 4.84
Weighted average shares outstanding:
Basic (in shares)	83,895	86,360	84,399	86,159
Diluted (in shares)	86,570	90,131	87,380	89,694