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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net income $ 241,616 $ 222,959
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) (721) 17,336
Net cash provided by operating activities 240,895 240,295
Cash flows from investing activities:    
Additions to property and equipment (26,422) (10,413)
Additions to capitalized software (26,193) (31,044)
Purchases of marketable securities (42,305) (48,653)
Prepayments and maturities of marketable securities 27,224 29,462
Sales of marketable securities 18,133 7,284
Sale of subsidiary, net of cash transferred 5,582 6,028
Purchases of other investments (2,000) (2,604)
Net cash used in investing activities (45,981) (49,940)
Cash flows from financing activities:    
Purchase and retirement of common stock (215,777) (144,121)
Proceeds from issuance of common stock 81,426 54,788
Tax benefit on stock options exercised 13,372 8,345
Payment of dividends (74,294) (34,400)
Net cash used in financing activities (195,273) (115,388)
Net (decrease) increase in cash and cash equivalents (359) 74,967
Cash and cash equivalents, beginning of period 578,273 452,247
Cash and cash equivalents, end of period $ 577,914 $ 527,214