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Consolidated Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 261,515 $ 180,506
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 1,361 4,351
Net cash provided by operating activities 262,876 184,857
Cash flows from investing activities:    
Additions to property and equipment (12,671) (10,247)
Additions to capitalized software (24,613) (33,292)
Purchases of marketable securities (74,957) (28,703)
Prepayments and maturities of marketable securities 64,626 26,811
Cash paid for acquisition, net of cash acquired (5,794) 0
Other investing activities (10,500) (1,450)
Net cash used in investing activities (63,909) (46,881)
Cash flows from financing activities:    
Repayments under revolving credit facility (30,000) 0
Purchase and retirement of common stock (189,372) (122,066)
Proceeds from issuance of common stock 69,958 29,127
Payment of dividends (94,318) (88,862)
Net cash used in financing activities (243,732) (181,801)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (6,036) 8,488
Net decrease in cash, cash equivalents and restricted cash (50,801) (35,337)
Cash, cash equivalents and restricted cash, beginning of period 747,752 699,201
Cash, cash equivalents and restricted cash, end of period $ 696,951 $ 663,864