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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 129,470 $ 109,242
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 7,103 (10,270)
Net cash provided by operating activities 136,573 98,972
Cash flows from investing activities:    
Additions to property and equipment (4,218) (20,674)
Additions to capitalized software (6,360) (6,458)
Purchases of marketable securities (51,524) (29,407)
Prepayments and maturities of marketable securities 42,446 37,623
Sales of marketable securities 0 64
Other investing activities (11,000) 1,500
Net cash used in investing activities (30,656) (17,352)
Cash flows from financing activities:    
Payment of contingent consideration (702) (633)
Purchase and retirement of common stock (71,206) (130,558)
Proceeds from issuance of common stock 15,523 18,593
Payment of dividends (53,127) (52,452)
Net cash used in financing activities (109,512) (165,050)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 1,551 (11,146)
Net decrease in cash, cash equivalents and restricted cash (2,044) (94,576)
Cash, cash equivalents and restricted cash, beginning of period 787,727 844,547
Cash, cash equivalents and restricted cash, end of period $ 785,683 $ 749,971