Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Cash flows from operating activities:
Net loss	$ (16,494)	$ (83,196)	$ (4,926)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	34,043	35,993	37,413
Unrealized (gain) loss on foreign exchange, net	(9,027)	(814)	(11,100)
Deferred income taxes	(388)	289	829
Asset impairments	3,144	15,306	8,827
Provision for doubtful accounts, net	3,230	25,997	12,087
Share-based compensation	10,736	11,236	12,503
Inventory write-down charges	0	3,108	7,490
Non-cash restructuring charges	0	0	6,413
Other non-cash items	503	4,029	534
Changes in operating assets and liabilities:
Accounts receivable, net of allowances	2,408	(15,604)	(15,288)
Inventories	20,371	(8,586)	(31,251)
Prepaid expenses and other assets	(4,532)	1,755	21,698
Accounts payable	(1,354)	23,260	(12,106)
Accrued expenses and other liabilities	3,836	8,765	(15,824)
Accrued restructuring	(952)	(3,677)	4,859
Income taxes	(5,770)	(8,163)	(33,809)
Cash provided by (used in) operating activities	39,754	9,698	(11,651)
Cash flows from investing activities:
Cash paid for purchases of property and equipment	(13,233)	(12,826)	(15,991)
Proceeds from disposal of property and equipment	2,438	(2)	236
Cash paid for intangible assets	(8,961)	(5,660)	(41,035)
Change in restricted cash	1,199	(139)	(1,202)
Other	(100)	0	0
Cash used in investing activities	(18,657)	(18,627)	(57,992)
Cash flows from financing activities:
Proceeds from preferred stock offering, net of issuance costs of $0.0 million and $15.8 million, respectively	0	0	182,220
Dividends—Series A preferred stock	(12,000)	(11,900)	(8,234)
Proceeds from bank borrowings	31,582	0	0
Repayment of bank borrowings and capital lease obligations	(35,640)	(5,290)	(5,177)
Deferred debt issuance costs	(481)	191	(75)
Issuances of common stock	420	1,864	1,342
Purchase of treasury stock, net of issuances	0	(85,926)	(145,858)
Repurchase of common stock for tax withholding	(324)	(261)	(787)
Excess tax benefit from share-based compensation	0	62	0
Cash provided by (used in) financing activities	(16,443)	(101,260)	23,431
Effect of exchange rate changes on cash	(430)	(13,982)	(3,420)
Net increase (decrease) in cash and cash equivalents	4,224	(124,171)	(49,632)
Cash and cash equivalents—beginning of period	143,341	267,512	317,144
Cash and cash equivalents—end of period	147,565	143,341	267,512
Supplemental disclosure of cash flow information—cash paid during the period for:
Interest, net of capitalized interest	653	917	616
Income taxes	12,344	19,923	33,655
Supplemental disclosure of non-cash investing and financing activities:
Assets acquired under capitalized leases	39	20	0
Accrued purchases of property and equipment	2,195	851	771
Accrued purchases of intangibles	533	0	2,988
Intrinsic value of beneficial conversion feature—Series A preferred stock	0	0	12,276
Accrued dividends	3,000	3,000	3,067
Accretion of dividend equivalents	3,244	2,978	2,735
Change in assets held for sale	2,428	(1,595)	0
Vendor financed insurance premiums	$ 2,082	$ 0	$ 0