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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Cash flows from operating activities: |  |
Net income | $ 72,270 | $ 50,235
Adjustments to reconcile net income to net cash provided by operating activities | (32,795) | (11,011)
Net cash provided by operating activities | 39,475 | 39,224
Cash flows from investing activities: |  |
Additions to property and equipment | (1,744) | (12,116)
Additions to capitalized software | (6,048) | (9,277)
Purchases of marketable securities | (11,578) | (9,646)
Prepayments and maturities of marketable securities | 9,835 | 10,464
Sales of marketable securities | 4,211 | 720
Purchases of other investments | 20 | 0
Sale of subsidiary, net of cash transferred (See Note 13) | (26,694) | 0
Net cash used in investing activities | (31,998) | (19,855)
Cash flows from financing activities: |  |
Purchase and retirement of common stock | (34,466) | (36,463)
Proceeds from issuance of common stock | 24,278 | 12,362
Tax benefit on stock options exercised | 2,563 | (1,609)
Payment of dividends | 0 | (26,518)
Net cash used in financing activities | (7,625) | (52,228)
Net decrease in cash and cash equivalents | (148) | (32,859)
Cash and cash equivalents, beginning of period | 452,247 | 420,986
Cash and cash equivalents, end of period | $ 452,099 | $ 388,127

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