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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 88,737 $ 77,497
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) (15,725) 1,148
Net cash provided by operating activities 73,012 78,645
Cash flows from investing activities:    
Additions to property and equipment (3,205) (4,609)
Additions to capitalized software (16,861) (9,477)
Purchases of marketable securities (20,445) (8,652)
Prepayments and maturities of marketable securities 15,166 12,090
Sales of marketable securities 0 185
Receipt of contingent payment from sale of SEI AK 0 2,791
Other investing activities 0 200
Net cash used in investing activities (25,345) (7,472)
Cash flows from financing activities:    
Purchase and retirement of common stock (56,553) (78,372)
Proceeds from issuance of common stock 16,847 6,476
Payment of dividends (44,597) (42,677)
Net cash used in financing activities (84,303) (114,573)
Effect of exchange rate changes on cash and cash equivalents 2,307 1,992
Net decrease in cash and cash equivalents (34,329) (41,408)
Cash and cash equivalents, beginning of period 695,701 679,661
Cash and cash equivalents, end of period $ 661,372 $ 638,253