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	$ 31,085	$ 28,965	$ 22,669
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,090	10,837	9,346
Loss on retirement of fixed assets	23	6	2
Amortization of deferred financing costs and accreted interest	541	303	480
Loss on extinguishment of debt			422
Share based compensation	8,209	6,918	6,974
Excess tax benefit on stock options	(6,775)	(1,514)	(1,354)
Deferred income taxes	4,970	2,746	1,634
Provision for doubtful accounts	97	38	46
Unrealized currency (gain) loss on foreign denominated intercompany transactions	(216)	(390)	94
Unrealized loss (gain) on derivatives		681	136
Changes in operating assets and liabilities, net of effect of acquisitions:
Accounts receivable	(1,437)	129	(1,835)
Prepaid expenses and other assets	(899)	488	117
Accounts payable	60	(113)	366
Accrued income taxes payable	3,312	(635)	(86)
Accrued expenses and other liabilities	1,820	900	1,275
Deferred revenue	(1,544)	1,069	(973)
Net cash provided by operating activities	51,336	50,428	39,313
Cash flows from investing activities:
Purchases of property and equipment	(2,124)	(1,486)	(1,925)
Purchase of exclusive license and other intangible assets		(150)
Acquisition of businesses, net of cash acquired	(72)	(51,525)	(219)
Net cash used in investing activities	(2,196)	(53,161)	(2,144)
Cash flows from financing activities:
Payments on long-term debt	(22,321)	(40,000)	(86,845)
Proceeds from issuance of debt, net of issuance costs		25,000	56,065
Excess tax benefit of stock options	6,775	1,514	1,354
Common stock dividend paid	(8,456)	(1,482)
Purchase of treasury stock	(2,193)
Proceeds from exercise of common stock options	16,109	3,215	3,330
Net cash used in financing activities	(10,086)	(11,753)	(26,096)
Effect of exchange rates on cash and cash equivalents	17	(24)	(9)
Increase (decrease) in cash and cash equivalents	39,071	(14,510)	11,064
Cash and cash equivalents, beginning of year	39,340	53,850	42,786
Cash and cash equivalents, end of year	78,411	39,340	53,850
Supplemental disclosures:
Interest paid	599	1,416	2,279
Income taxes paid	8,456	11,518	9,070
Non cash transactions:
Dividends declared	2,357	1,492
Excess tax benefit on stock options		$ 413