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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 240,521 $ 261,515
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) (22,876) 1,361
Net cash provided by operating activities 217,645 262,876
Cash flows from investing activities:    
Additions to property and equipment (18,239) (12,671)
Additions to capitalized software (19,188) (24,613)
Purchases of marketable securities (77,891) (74,957)
Prepayments and maturities of marketable securities 85,012 64,626
Cash paid for acquisition, net of cash acquired 0 (5,794)
Other investing activities 0 (10,500)
Net cash used in investing activities (30,306) (63,909)
Cash flows from financing activities:    
Repayments under revolving credit facility 0 (30,000)
Purchase and retirement of common stock (183,396) (189,372)
Proceeds from issuance of common stock 24,272 69,958
Payment of dividends (100,745) (94,318)
Net cash used in financing activities (259,869) (243,732)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 277 (6,036)
Net decrease in cash, cash equivalents and restricted cash (72,253) (50,801)
Cash, cash equivalents and restricted cash, beginning of period 758,039 747,752
Cash, cash equivalents and restricted cash, end of period 685,786 696,951
Non-cash operating activities:    
Operating lease right-of-use assets and lease liabilities recorded upon adoption of ASC 842 $ 44,169 $ 0