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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 77,497 $ 84,611
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 524 (6,681)
Net cash provided by operating activities 78,021 77,930
Cash flows from investing activities:    
Additions to restricted cash 0 (4)
Additions to property and equipment (4,609) (7,386)
Additions to capitalized software (9,477) (7,989)
Purchases of marketable securities (8,652) (4,107)
Prepayments and maturities of marketable securities 12,090 7,375
Sales of marketable securities 185 0
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 (7,472) (10,320)
Cash flows from financing activities:    
Purchase and retirement of common stock (78,372) (67,534)
Proceeds from issuance of common stock 6,476 19,209
Tax benefit on stock options exercised 624 3,268
Payment of dividends (42,677) (40,178)
Net cash used in financing activities (113,949) (85,235)
Effect of exchange rate changes on cash and cash equivalents 1,992 (6,561)
Net decrease in cash and cash equivalents (41,408) (24,186)
Cash and cash equivalents, beginning of period 679,661 667,446
Cash and cash equivalents, end of period $ 638,253 $ 643,260