Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities
Net income	$ 47,704	$ 31,428	$ 16,102
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,781	6,350	6,790
Stock-based compensation expense	6,859	8,969	8,414
Deferred taxes	16,129	15,767	12,255
Provision for bad debts	1,177	602	652
Gain on sale of securities		(411)
Changes in operating assets and liabilities:
(Increase) in accounts receivable	(11,665)	(3,134)	(10,519)
(Increase) decrease in prepaid expenses and other assets	(4,074)	57	136
Increase in accrued employee compensation	1,634	2,634	4,718
Increase in deferred revenue	755	309	1,959
Increase in accounts payable, accrued expenses and other liabilities	178	1,575	2,820
Net cash provided by operating activities	65,478	64,146	43,327
Cash flows from investing activities
Acquisition of business			(1,368)
Securities available-for-sale:
Proceeds from maturities and sales	27,419	65,365	22,062
Purchases	(32,302)	(66,008)	(57,406)
Securities and cash provided as collateral	3,532	32	(655)
Purchases of furniture, equipment and leasehold improvements	(3,160)	(5,205)	(4,909)
Capitalization of software development costs	(4,065)	(1,904)	(1,889)
Net cash (used in) investing activities	(8,576)	(7,720)	(44,165)
Cash flows from financing activities
Cash dividend on common stock and Series B Preferred Stock	(13,683)	(10,630)	(2,650)
Proceeds from exercise of stock options and grants of restricted stock, net of surrenders on stock option exercises and withholding tax on stock vesting	2,392	4,706	242
Excess tax benefits (decrements) from stock-based compensation	7,305	1,619	(266)
Purchase of treasury stock-common stock voting	(6,935)	(30,000)
Other	(278)	456	28
Net cash (used in) financing activities	(11,199)	(33,849)	(2,646)
Effect of exchange rate changes on cash and cash equivalents	(1,077)	(924)	(498)
Cash and cash equivalents
Net increase (decrease) for the period	44,626	21,653	(3,982)
Beginning of period	124,994	103,341	107,323
End of period	169,620	124,994	103,341
Cash paid during the year
Cash paid for income taxes	10,177	2,228	837
Non-cash activity
Conversion of Series B Preferred Stock to common stock	30,315
Capital lease obligation			$ 723