Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities
Net income	$ 23,175	$ 22,991
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,147	9,036
Loss on retirement of fixed assets	78	23
Amortization of deferred financing costs and accretion of interest	337	414
Adjustment to contingent consideration	(1,152)
Share based compensation	7,835	5,994
Excess tax benefit on stock options	(3,011)	(5,242)
Provision for doubtful accounts	29	84
Deferred income taxes	2,202	4,382
Unrealized currency gain on foreign denominated intercompany transactions	423	(29)
Changes in operating assets and liabilities:
Accounts receivable	(366)	(905)
Prepaid expenses and other assets	934	(311)
Accounts payable	996	35
Accrued income taxes	6,493	1,099
Accrued expenses and other liabilities	(808)	(520)
Deferred revenue	86	(1,025)
Net cash provided by operating activities	46,398	36,026
Cash flows from investing activities
Purchases of property and equipment	(4,474)	(1,373)
Purchases of exclusive license	(100)
Acquisition of business, net of cash acquired	(10,621)	(72)
Net cash used in investing activities	(15,195)	(1,445)
Cash flows from financing activities
Payments on line of credit		(22,321)
Excess tax benefit on stock options	3,011	5,242
Common stock dividends paid	(8,670)	(6,112)
Purchase of treasury stock	(26,065)
Proceeds from exercises of common stock options	5,285	13,644
Net cash used in financing activities	(26,439)	(9,547)
Effect of exchange rates on cash and cash equivalents	(587)	(39)
Increase in cash and cash equivalents	4,177	24,995
Cash and cash equivalents at beginning of period	78,411	39,340
Cash and cash equivalents at end of period	$ 82,588	$ 64,335