Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income	$ 71,546	$ 53,170
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,857	12,954
Stock-based compensation expense	9,276	7,179
Deferred taxes	(1,250)	1,575
Other	1,638	1,482
Changes in operating assets and liabilities:
(Increase) in accounts receivable	(15,595)	(2,321)
(Increase) decrease in prepaid expenses and other assets	(347)	1,245
(Decrease) in accrued employee compensation	(2,472)	(5,617)
(Decrease) in income and other tax liabilities	(1,309)	(110)
(Decrease) increase in deferred revenue	(250)	558
Increase (decrease) in accounts payable, accrued expenses and other liabilities	1,244	(1,526)
Net cash provided by operating activities	76,338	68,589
Securities available-for-sale:
Proceeds from maturities	25,048	13,536
Purchases	(57,175)	(4,181)
Purchases of furniture, equipment and leasehold improvements	(3,730)	(4,002)
Capitalization of software development costs	(7,517)	(7,412)
Other	(141)	595
Net cash (used in) investing activities	(43,515)	(1,464)
Cash flows from financing activities
Cash dividend on common stock	(22,201)	(18,062)
Exercise of stock options	1,530	1,390
Withholding tax payments on restricted stock vesting and stock option exercises	(4,450)	(5,008)
Excess tax benefits from stock-based compensation	4,202	3,203
Repurchases of common stock	(20,025)	(25,442)
Other		(42)
Net cash (used in) financing activities	(40,944)	(43,961)
Effect of exchange rate changes on cash and cash equivalents	(427)	(755)
Cash and cash equivalents
Net (decrease) increase for the period	(8,548)	22,409
Beginning of period	168,924	132,691
End of period	$ 160,376	$ 155,100