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	$ 33,932	$ 36,826	$ 22,068
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization of fixed and intangible assets	14,845	13,487	13,546
Amortization of other long term assets	4,598	2,925	1,983
Amortization of discounted liabilities	174	818	1,371
Stock-based compensation	3,819	2,950	1,994
Tax benefit from exercise of stock options	(440)	(621)
Increase (decrease) in deferred income taxes	2,523	(886)	4,711
Loss from equity method investment	986
Changes in assets and liabilities associated with operations:
Decrease (increase) in net receivables	2,351	(7,505)	(35,021)
(Increase) decrease in inventories	(51,879)	(16,883)	2,986
(Increase) decrease in income tax receivable/payable, net	(10,961)	2,137	6,512
Increase in prepaid expenses and other assets	(19,733)	(23,725)	(1,823)
Increase in accounts payable	8,252	9,781	8,384
(Decrease) increase in deferred revenue	(16,639)	12,856	2,003
Increase in other payables and accrued expenses	21,958	8,264	10,552
Net cash (used in) provided by operating activities	(6,214)	40,424	39,266
Cash flows from investing activities:
Capital expenditures	(15,260)	(17,628)	(6,261)
Investment	(3,687)
Acquisitions of intangible assets		(3,473)	(316)
Net cash used in investing activities	(18,947)	(21,101)	(6,577)
Cash flows from financing activities:
Net borrowings (repayments) under line of credit agreement	51,550		(7,300)
Payments on long-term debt	(46,000)	(8,443)	(8,429)
Payment on other long-term liabilities	(1,831)	(6,035)	(401)
Tax benefit from exercise of stock options	440	621
(Increase) decrease in other notes payable	(6,154)	(51)	20,063
Repurchases of common stock	(1,934)
Proceeds from the issuance of common stock (sale of stock under ESPP and exercise of stock options)	1,610	3,227	580
Non-controlling interest contribution		400
Payment of cash dividends	(4,804)	(6,148)	(2,205)
Net cash (used in) provided by financing activities	(7,123)	(16,429)	2,308
Net (decrease) increase in cash	(32,284)	2,894	34,997
Effect of exchange rate changes on cash	488	497	(1,070)
Cash at beginning of year	38,476	35,085	1,158
Cash at end of year	6,680	38,476	35,085
Cash paid during the year for:
Interest	1,777	1,891	2,055
Income taxes	25,271	18,048	6,359
Supplemental schedule of non-cash investing and financing activities:
Product Line Acquisitions			316
Additions to intangible assets and related liabilities		$ 1,073	$ 6,802