Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 170,851	$ 157,633
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	(14,067)	(15,846)
Net cash provided by operating activities	156,784	141,787
Cash flows from investing activities:
Additions to restricted cash	(834)	0
Additions to property and equipment	(15,727)	(18,632)
Additions to capitalized software	(16,069)	(18,262)
Purchases of marketable securities	(26,854)	(34,675)
Prepayments and maturities of marketable securities	16,772	16,203
Sales of marketable securities	6,862	18,048
Receipt of contingent payment from sale of SEI AK	2,791	5,582
Purchases of other investments	(1,000)	(2,000)
Net cash used in investing activities	(34,059)	(33,736)
Cash flows from financing activities:
Purchase and retirement of common stock	(133,429)	(140,294)
Proceeds from issuance of common stock	42,661	51,571
Tax benefit on stock options exercised	8,233	7,617
Payment of dividends	(80,030)	(74,256)
Net cash used in financing activities	(162,565)	(155,362)
Effect of exchange rate changes on cash and cash equivalents	(2,765)	1,205
Net decrease in cash and cash equivalents	(42,605)	(46,106)
Cash and cash equivalents, beginning of period	667,446	578,273
Cash and cash equivalents, end of period	$ 624,841	$ 532,167