Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 174,098	$ 98,492	$ 101,488
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	80,529	70,025	71,455
Share-based compensation	14,983	12,802	12,902
Unrealized foreign exchange loss, net	10,200	41,418	5,646
Other (gains) losses	(19,449)	0	1,801
Deferred income taxes	850	(5,017)	(5,012)
Accretion of convertible debt discount and amortization of debt issuance costs	12,885	12,164	2,934
Changes in working capital, net of amounts acquired:
Income taxes payable, net	13,935	(13,467)	5,642
Restricted cash	(23,342)	17,621	4,653
Inventory - PINs and other	(6,712)	7,058	(19)
Trade accounts receivable	(87,732)	(66,075)	(17,058)
Prepaid expenses and other current assets	(68,549)	(39,796)	(21,266)
Trade accounts payable	9,705	39,631	25,773
Deferred revenue	9,426	3,898	4,085
Accrued expenses and other current liabilities	257,287	37,453	42,376
Changes in noncurrent assets and liabilities	(9,932)	(1,153)	(373)
Net cash provided by operating activities	368,182	215,054	235,027
Cash flows from investing activities:
Acquisitions, net of cash acquired	(68,266)	(113,969)	(84,703)
Purchases of property and equipment	(87,411)	(74,620)	(63,098)
Purchases of other long-term assets	(6,175)	(6,391)	(5,950)
Proceeds from sale of investment	11,900	0	0
Other, net	1,288	997	719
Net cash used in investing activities	(148,664)	(193,983)	(153,032)
Cash flows from financing activities:
Proceeds from issuance of shares	6,292	10,510	11,099
Repurchase of shares	(77,360)	(6,078)	(66,390)
Borrowings from revolving credit agreements	2,648,093	1,321,622	2,184,153
Repayments of revolving credit agreements	(2,495,632)	(1,318,759)	(2,307,622)
Repayments of long-term debt obligations	(7,031)	(5,156)	(4,814)
Repayments of capital lease obligations	(2,943)	(3,211)	(2,518)
Net borrowing (repayments of) from short-term debt obligations	6,750	(1,825)	4,336
Proceeds from long-term debt obligations	0	0	411,500
Debt issuance costs	0	0	(13,259)
Other, net	1,341	1,707	1,596
Net cash provided by (used in) financing activities	79,510	(1,190)	218,081
Effect of exchange rate changes on cash and cash equivalents	(22,132)	(30,373)	(41,892)
Increase (decrease) in cash and cash equivalents	276,896	(10,492)	258,184
Cash and cash equivalents at beginning of period	457,518	468,010	209,826
Cash and cash equivalents at end of period	734,414	457,518	468,010
Interest paid during the period	14,442	11,804	7,685
Income taxes paid during the period	43,178	54,607	39,574
Other Significant Noncash Transaction, Value of Consideration Received	7,549
Equity issued in connection with acquisition	$ 0	$ 43,061	$ 56,554