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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ 372,689 $ 389,834
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 8,846 28,064
Net cash provided by operating activities 381,535 417,898
Cash flows from investing activities:    
Additions to property and equipment (30,515) (21,652)
Additions to capitalized software (26,821) (33,371)
Purchases of marketable securities (126,030) (122,259)
Prepayments and maturities of marketable securities 137,783 116,568
Cash paid for acquisition, net of cash acquired 0 (5,794)
Other investing activities 2,538 (10,900)
Net cash used in investing activities (43,045) (77,408)
Cash flows from financing activities:    
Repayments under revolving credit facility 0 (30,000)
Purchase and retirement of common stock (262,861) (290,563)
Proceeds from issuance of common stock 41,864 78,667
Payment of dividends (100,745) (94,318)
Net cash used in financing activities (321,742) (336,214)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (3,878) (6,552)
Net increase (decrease) in cash, cash equivalents and restricted cash 12,870 (2,276)
Cash, cash equivalents and restricted cash, beginning of period 758,039 747,752
Cash, cash equivalents and restricted cash, end of period 770,909 745,476
Non-cash operating activities:    
Operating lease right-of-use assets and lease liabilities recorded upon adoption of ASC 842 $ 44,169 $ 0