Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net income	$ 48,831	$ 35,666
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,215	8,472
Stock-based compensation expense	6,025	4,651
Deferred taxes	858	2,546
Other	1,201	852
Changes in operating assets and liabilities:
(Increase) in accounts receivable	(13,197)	(6,764)
(Increase) in prepaid expenses and other assets	(5,907)	(1,683)
(Decrease) in accrued employee compensation	(9,201)	(11,805)
Increase in income and other tax liabilities	1,336	2,571
Increase in deferred revenue	185	237
Increase in accounts payable, accrued expenses and other liabilities	1,249	1,669
Net cash provided by operating activities	40,595	36,412
Securities available-for-sale:
Proceeds from maturities	15,328	5,410
Purchases	(19,098)	(4,181)
Purchases of furniture, equipment and leasehold improvements	(2,345)	(3,754)
Capitalization of software development costs	(4,816)	(4,971)
Other	(4)	(33)
Net cash (used in) investing activities	(10,935)	(7,529)
Cash flows from financing activities
Cash dividend on common stock	(14,862)	(12,164)
Exercise of stock options	990	845
Withholding tax payments on restricted stock vesting and stock option exercises	(4,243)	(4,968)
Excess tax benefits from stock-based compensation	3,755	2,576
Repurchases of common stock	(14,464)	(13,748)
Other		(42)
Net cash (used in) financing activities	(28,824)	(27,501)
Effect of exchange rate changes on cash and cash equivalents	(497)	(919)
Cash and cash equivalents
Net increase for the period	339	463
Beginning of period	168,924	132,691
End of period	$ 169,263	$ 133,154