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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 157,633 $ 155,764
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) (14,641) (32,450)
Net cash provided by operating activities 142,992 123,314
Cash flows from investing activities:    
Additions to property and equipment (18,632) (3,564)
Additions to capitalized software (18,262) (22,186)
Purchases of marketable securities (34,675) (15,484)
Prepayments and maturities of marketable securities 16,203 17,807
Sales of marketable securities 18,048 5,988
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 (33,736) (14,015)
Cash flows from financing activities:    
Purchase and retirement of common stock (140,294) (86,376)
Proceeds from issuance of common stock 51,571 39,634
Tax benefit on stock options exercised 7,617 6,655
Payment of dividends (74,256) (34,400)
Net cash used in financing activities (155,362) (74,487)
Net (decrease) increase in cash and cash equivalents (46,106) 34,812
Cash and cash equivalents, beginning of period 578,273 452,247
Cash and cash equivalents, end of period $ 532,167 $ 487,059