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:
Consolidated net income	$ 7,331	$ 19,578	$ 29,001
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,207	13,676	15,267
Provision for inventory	2,153	4,472	6,646
Share-based compensation	5,499	4,580	3,276
Deferred income taxes	3,045	(14,979)	78
Earnings from equity investment	(1,469)	(556)	(1,171)
Loss (gain) on disposal of business	592	(2,255)
Business acquisition inventory fair value adjustment	690
Non-cash interest expense	965	1,049	1,881
Non-cash restructuring charges	432	3,825	1,163
Other	453	(50)	199
Changes in operating assets and liabilities:
Accounts receivable	(1,886)	2,261	4,822
Inventories	(3,220)	(4,361)	(6,062)
Deferred cost of goods sold	105	1,522	5,791
Income taxes receivable, prepaid expenses, and other current assets	12,031	6,545	(837)
Deferred revenue	(1,004)	(4,133)	(9,343)
Long-term income taxes payable	532	(6,293)	1,413
Accounts payable, short-term income taxes payable, accrued expenses, and other current liabilities	2,874	3,783	(5,898)
Other non-current assets and liabilities	(130)	(234)	(1,053)
Cash provided by operating activities	49,200	28,430	45,173
Cash flows from investing activities:
Purchases of property, plant and equipment	(4,988)	(4,308)	(4,217)
Acquisition of business	(80,773)
Proceeds from sale of business, net of transaction costs	8,190	7,000
Proceeds from the sale of property, plant and equipment	4,615	283
Cash provided by (used in) investing activities	(72,956)	2,975	(4,217)
Cash flows from financing activities:
Repayments of long-term debt and revolving credit facility	(38,500)	(23,000)	(113,214)
Proceeds from term loan and revolving credit facility	60,000	5,000	73,107
Payments for debt issuance costs	(145)	(1,826)	(2,988)
Payments of withholding taxes from stock-based awards	(1,495)	(543)
Repurchase of common stock	(526)
Excess tax benefits from stock-based awards	35	36
Capital lease payments	(795)	(779)
Cash provided by (used in) financing activities	18,574	(21,112)	(43,095)
Effect of exchange rates on cash and cash equivalents	374	660	193
Increase (decrease) in cash and cash equivalents	(4,808)	10,953	(1,946)
Cash and cash equivalents, beginning of year	65,788	54,835	56,781
Cash and cash equivalents, end of year	60,980	65,788	54,835
Supplemental disclosure of cash flow information:
Cash paid for interest	2,291	2,067	12,464
Cash paid for income taxes	2,197	3,440	1,912
Income tax refunds received	12,607	222	25
Supplemental disclosure of non-cash investing activity:
Accrual for capital expenditures	184	925	362
Supplemental disclosure of non-cash financing activity:
Issuance of PIK notes			532
Assets acquired under capital lease obligation			$ 2,214