Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities
Net income	$ 15,326	$ 13,493
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,569	1,854
Stock-based compensation expense	1,997	1,962
Deferred taxes	2,764	2,623
Provision for bad debts	40	354
Other	(307)
Changes in operating assets and liabilities
(Increase) decrease in accounts receivable	(1,136)	2,777
Decrease in prepaid expenses and other assets	76	1,665
(Decrease) in accrued employee compensation	(14,969)	(13,608)
(Decrease) in deferred revenue	(1,041)	(97)
Increase in accounts payable, accrued expenses and other liabilities	4,960	2,351
Net cash provided by operating activities	10,279	13,374
Cash flows from investing activities
Acquisition of business, net of cash acquired	(37,118)
Securities available-for-sale:
Proceeds from sales	30,900	13,577
Proceeds from maturities	2,770	7,962
Purchases		(3,714)
Purchases of furniture, equipment and leasehold improvements	(794)	(607)
Capitalization of software development costs	(1,366)	(1,298)
Other	64	(28)
Net cash (used in) provided by investing activities	(5,544)	15,892
Cash flows from financing activities
Cash dividend on common stock	(5,405)	(4,201)
Exercise of stock options	630	326
Withholding tax payments on restricted stock vesting and stock option exercises	(5,001)	(5,818)
Excess tax benefits from stock-based compensation	1,927	2,163
Repurchase of common stock		(71,116)
Other	(78)	(72)
Net cash used in financing activities	(7,927)	(78,718)
Effect of exchange rate changes on cash and cash equivalents	203	(359)
Cash and cash equivalents
Net decrease for the period	(2,989)	(49,811)
Beginning of year	128,908	169,620
End of period	125,919	119,809
Cash paid during the period:
Cash paid for income taxes	829	988
Non-cash investing and financing activity:
Conversion of common stock non-voting to common stock voting		15,880
Liabilities assumed in connection with the Xtrakter acquisition:
Fair value of assets acquired	44,486
Cash paid for the capital stock	(37,118)
Liabilities assumed	$ 7,368