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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 74,820 $ 72,270
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) (30,878) (32,795)
Net cash provided by operating activities 43,942 39,475
Cash flows from investing activities:    
Additions to property and equipment (7,627) (1,744)
Additions to capitalized software (9,408) (6,048)
Purchases of marketable securities (6,645) (11,578)
Prepayments and maturities of marketable securities 9,077 9,835
Sales of marketable securities 0 4,211
Sale of subsidiary, net of cash transferred 0 (26,694)
Other 0 20
Net cash used in investing activities (14,603) (31,998)
Cash flows from financing activities:    
Purchase and retirement of common stock (65,948) (34,466)
Proceeds from issuance of common stock 35,793 24,278
Tax benefit on stock options exercised 5,409 2,563
Payment of dividends (37,314) 0
Net cash used in financing activities (62,060) (7,625)
Net decrease in cash and cash equivalents (32,721) (148)
Cash and cash equivalents, beginning of period 578,273 452,247
Cash and cash equivalents, end of period $ 545,552 $ 452,099