Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities
Net income	$ 34,669	$ 26,122
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,073	3,815
Stock-based compensation expense	4,178	4,028
Deferred taxes	2,262	2,619
Non-cash out-of-period adjustment	(972)
Provision for bad debts	183	446
Other	(155)	471
Changes in operating assets and liabilities
(Increase) decrease in accounts receivable	(7,427)	2,515
(Decrease) in prepaid expenses and other assets	(2,206)	(5,241)
(Decrease) in accrued employee compensation	(8,066)	(8,922)
(Decrease) in deferred revenue	(1,002)	(200)
Increase in accounts payable, accrued expenses and other liabilities	3,039	242
Net cash provided by operating activities	30,249	25,895
Cash flows from investing activities
Acquisition of business, net of cash acquired	(37,827)
Securities available-for-sale:
Proceeds from sales	30,900	13,577
Proceeds from maturities	5,185	11,423
Purchases		(6,376)
Purchases of furniture, equipment and leasehold improvements	(7,416)	(1,044)
Capitalization of software development costs	(3,284)	(2,558)
Other	63	(9)
Net cash (used in) provided by investing activities	(12,379)	15,013
Cash flows from financing activities
Cash dividend on common stock	(10,258)	(8,282)
Exercise of stock options	1,380	5,428
Withholding tax payments on restricted stock vesting and stock option exercises	(5,001)	(20,003)
Excess tax benefits from stock-based compensation	2,651	13,681
Repurchase of common stock		(71,143)
Other	(158)	(146)
Net cash (used in) financing activities	(11,386)	(80,465)
Effect of exchange rate changes on cash and cash equivalents	76	(468)
Cash and cash equivalents
Net increase (decrease) for the period	6,560	(40,025)
Beginning of year	128,908	169,620
End of period	135,468	129,595
Cash paid during the period:
Cash paid for income taxes	12,612	6,936
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	44,745
Cash paid for the capital stock	(37,827)
Liabilities assumed	$ 6,918