Condensed 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	$ 17,344	$ 15,685
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,452	1,941
Benefit for deferred taxes	(7,538)	(1,428)
Share based compensation	511	548
Provision for doubtful accounts	0	266
Debt discount amortization on convertible debt	13	0
Unrealized foreign exchange loss	9	661
Gain on put option	(81)	0
Reduction of acquisition earnout accruals	(299)	0
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable	(2,234)	1,771
Other assets	357	(302)
Accounts payable and accrued expenses	4,719	(861)
Accrued payroll and related benefits	(643)	(1,575)
Deferred revenue	(350)	(560)
Deferred rent	44	(75)
Other current liabilities	(39)	(2,336)
Net cash provided by operating activities	14,265	13,735
Cash flows from investing activities:
Investment in USIX	(570)	0
Maturities of marketable securities (net of purchases)	208	979
Capital expenditures	(345)	(673)
Net cash provided by/(used in) investing activities	(707)	306
Cash flows from financing activities:
Principal payments of term loan obligation	(4,125)	0
Excess tax benefit from share-based compensation	0	27
Proceeds from the exercise of stock options	553	14
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Value	(564)	0
Dividend payments	(2,794)	(1,464)
Principal payments of debt obligations	(12)	0
Payments of capital lease obligations	(80)	(45)
Net cash provided used in financing activities	(7,022)	(1,468)
Effect of foreign exchange rates on cash	20	871
Net change in cash and cash equivalents	6,556	13,444
Cash and cash equivalents at the beginning of the period	36,449	23,696
Cash and cash equivalents at the end of the period	43,005	37,140
Supplemental disclosures of cash flow information:
Interest paid	352	312
Income taxes paid	$ 3,548	$ 3,030