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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 282,245 $ 245,206
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 34,139 44,228
Net cash provided by operating activities 316,384 289,434
Cash flows from investing activities:    
Additions to property and equipment (20,318) (26,656)
Additions to capitalized software (48,573) (33,196)
Purchases of marketable securities (50,235) (55,162)
Prepayments and maturities of marketable securities 52,644 42,625
Sales of marketable securities 0 1,225
Cash paid for acquisition, net of cash acquired (80,131) 0
Receipt of contingent payment from sale of SEI AK 0 2,791
Other investing activities (1,450) 1,313
Net cash used in investing activities (148,063) (67,060)
Cash flows from financing activities:    
Borrowings under revolving credit facility 40,000 0
Purchase and retirement of common stock (186,494) (224,815)
Proceeds from issuance of common stock 41,626 35,159
Payment of dividends (88,862) (84,686)
Net cash used in financing activities (193,730) (274,342)
Effect of exchange rate changes on cash and cash equivalents 14,679 (4,531)
Net decrease in cash and cash equivalents (10,730) (56,499)
Cash and cash equivalents, beginning of period 695,701 679,661
Cash and cash equivalents, end of period $ 684,971 $ 623,162