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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 113,981 $ 139,838
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) (54,082) (35,664)
Net cash provided by operating activities 59,899 104,174
Cash flows from investing activities:    
Additions to property and equipment (7,317) (5,611)
Additions to capitalized software (9,937) (12,887)
Purchases of marketable securities (43,672) (15,466)
Prepayments and maturities of marketable securities 45,200 18,588
Net cash used in investing activities (15,726) (15,376)
Cash flows from financing activities:    
Repayments under revolving credit facility 0 (10,000)
Purchase and retirement of common stock (90,777) (87,995)
Proceeds from issuance of common stock 8,893 57,889
Payment of dividends (50,760) (47,179)
Net cash used in financing activities (132,644) (87,285)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 3,272 2,541
Net (decrease) increase in cash, cash equivalents and restricted cash (85,199) 4,054
Cash, cash equivalents and restricted cash, beginning of period 758,039 747,752
Cash, cash equivalents and restricted cash, end of period 672,840 751,806
Non-cash operating activities:    
Operating lease right-of-use assets and lease liabilities recorded upon adoption of ASC 842 $ 44,169 $ 0