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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 158,502 $ 170,851
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 948 (14,067)
Net cash provided by operating activities 159,450 156,784
Cash flows from investing activities:    
Additions to restricted cash 0 (834)
Additions to property and equipment (9,049) (15,727)
Additions to capitalized software (19,597) (16,069)
Purchases of marketable securities (32,648) (26,854)
Prepayments and maturities of marketable securities 26,148 16,772
Sales of marketable securities 185 6,862
Receipt of contingent payment from sale of SEI AK 2,791 2,791
Other investing activities 200 (1,000)
Net cash used in investing activities (31,970) (34,059)
Cash flows from financing activities:    
Purchase and retirement of common stock (155,730) (133,429)
Proceeds from issuance of common stock 26,336 42,661
Tax benefit on stock options exercised 4,004 8,233
Payment of dividends (84,626) (80,030)
Net cash used in financing activities (210,016) (162,565)
Effect of exchange rate changes on cash and cash equivalents (2,358) (2,765)
Net decrease in cash and cash equivalents (84,894) (42,605)
Cash and cash equivalents, beginning of period 679,661 667,446
Cash and cash equivalents, end of period $ 594,767 $ 624,841