Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities
Net income	$ 76,016	$ 60,069	$ 47,704
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,051	8,233	6,781
Stock-based compensation expense	8,879	8,385	6,859
Deferred taxes	1,001	(643)	16,129
Gain on the sale of discontinued operations	(7,642)
Other	(296)	1,204	1,177
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(1,714)	4,607	(11,665)
(Increase) decrease in prepaid expenses and other assets	(1,846)	412	(4,074)
Increase in accrued employee compensation	3,820	491	1,634
(Decrease) increase in deferred revenue	(1,571)	(462)	755
Increase (decrease) in accounts payable, accrued expenses and other liabilities	1,181	(714)	178
Net cash provided by operating activities	90,879	81,582	65,478
Cash flows from investing activities
Acquisition of business, net of cash acquired	(37,827)
Cash proceeds from the sale of discontinued operations, net of cash sold	9,346
Securities available-for-sale:
Proceeds from sales	30,900	23,663
Proceeds from maturities	12,515	18,313	27,419
Purchases	(60,755)	(16,543)	(32,302)
(Increase) decrease in securities and cash provided as collateral	(18)	(43)	3,532
Purchases of furniture, equipment and leasehold improvements	(15,337)	(5,153)	(3,160)
Capitalization of software development costs	(7,945)	(5,207)	(4,065)
Net cash (used in ) provided by investing activities	(69,121)	15,030	(8,576)
Cash flows from financing activities
Cash dividend on common stock	(19,837)	(64,041)	(13,683)
Exercise of stock options	3,039	8,525	6,807
Withholding tax payments on restricted stock vesting and stock option exercises	(5,001)	(20,003)	(4,415)
Excess tax benefits from stock-based compensation	5,032	14,775	7,305
Repurchase of common stock		(75,133)	(6,935)
Other	(307)	(298)	(278)
Net cash (used in) financing activities	(17,074)	(136,175)	(11,199)
Effect of exchange rate changes on cash and cash equivalents	(901)	(1,149)	(1,077)
Cash and cash equivalents
Net increase (decrease) for the period	3,783	(40,712)	44,626
Beginning of period	128,908	169,620	124,994
End of period	132,691	128,908	169,620
Cash paid during the year
Cash paid for income taxes	30,768	15,102	10,177
Non-cash investing and financing activity:
Conversion of Series B Preferred Stock to common stock			30,315
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	44,791
Cash paid for the capital stock	(37,827)
Liabilities assumed	$ 6,964