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	$ 8,616	$ 5,720
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,997	2,333
Loss on retirement of fixed assets	4
Amortization of deferred financing costs	75	76
Share based compensation	1,749	1,923
Excess tax benefit on stock options	(1,976)	(352)
Provision for doubtful accounts	39	26
Deferred income taxes	1,940	116
Unrealized currency gain on foreign denominated intercompany transactions	(49)	(258)
Unrealized loss on derivatives		234
Changes in operating assets and liabilities:
Accounts receivable	(1,762)	360
Prepaid expenses and other assets	(430)	(407)
Accounts payable	(198)	(609)
Accrued income taxes	(1,251)	1,136
Accrued expenses and other liabilities	(2,664)	(2,939)
Deferred revenue	(359)	670
Net cash provided by operating activities	6,731	8,029
Cash flows from investing activities
Purchases of property and equipment	(388)	(296)
Purchase of exclusive license and other intangible assets		(150)
Acquisition of business, net of cash acquired	(72)	(46,536)
Increase in restricted cash for acquisition of business		(2,613)
Net cash used in investing activities	(460)	(49,595)
Cash flows from financing activities
Payments on long-term debt	(10,000)	(10,000)
Proceeds from issuance of long-term debt		25,000
Excess tax benefit on stock options	1,976	352
Common stock dividend paid	(1,492)
Proceeds from exercises of common stock options	7,031	403
Net cash (used in) provided by financing activities	(2,485)	15,755
Effect of exchange rates on cash and cash equivalents	(143)	38
Increase (decrease) in cash and cash equivalents	3,643	(25,773)
Cash and cash equivalents at beginning of period	39,340	53,850
Cash and cash equivalents at end of period	$ 42,983	$ 28,077