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Consolidated Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 389,834 $ 282,245
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 28,064 34,142
Net cash provided by operating activities 417,898 316,387
Cash flows from investing activities:    
Additions to property and equipment (21,652) (20,318)
Additions to capitalized software (33,371) (48,573)
Purchases of marketable securities (122,259) (50,235)
Prepayments and maturities of marketable securities 116,568 52,644
Cash paid for acquisition, net of cash acquired (5,794) (80,131)
Other investing activities (10,900) (1,450)
Net cash used in investing activities (77,408) (148,063)
Cash flows from financing activities:    
Borrowings under revolving credit facility 0 40,000
Repayments under revolving credit facility (30,000) 0
Purchase and retirement of common stock (290,563) (186,494)
Proceeds from issuance of common stock 78,667 41,626
Payment of dividends (94,318) (88,862)
Net cash used in financing activities (336,214) (193,730)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (6,552) 14,679
Net decrease in cash, cash equivalents and restricted cash (2,276) (10,727)
Cash, cash equivalents and restricted cash, beginning of period 747,752 699,201
Cash, cash equivalents and restricted cash, end of period $ 745,476 $ 688,474