Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 10,238	$ (16,494)	$ (83,196)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	33,130	34,043	35,993
Unrealized foreign currency (gain) loss, net	1,025	(9,027)	(814)
Share-based compensation	9,773	10,736	11,236
Asset impairments	5,284	3,144	15,306
(Recovery) provision for doubtful accounts, net	(589)	3,230	25,997
Deferred taxes	(3,093)	(388)	289
Other non-cash items	(2,406)	503	7,137
Changes in operating assets and liabilities:
Accounts receivable, net of allowances	620	2,408	(15,604)
Inventories	23,319	20,371	(8,586)
Prepaid expenses and other assets	18,907	(4,532)	1,755
Accounts payable	(2,714)	(1,354)	23,260
Accrued expenses and other liabilities	5,489	2,884	5,088
Income taxes	(719)	(5,770)	(8,163)
Cash provided by operating activities	98,264	39,754	9,698
Cash flows from investing activities:
Purchases of property, equipment, and software	(13,117)	(22,194)	(18,486)
Proceeds from disposal of property and equipment	1,579	2,438	(2)
Change in restricted cash	566	1,199	(139)
Other	0	(100)	0
Cash used in investing activities	(10,972)	(18,657)	(18,627)
Cash flows from financing activities:
Proceeds from bank borrowings	5,500	31,582	0
Repayments of bank borrowings and capital lease obligations	(8,611)	(35,640)	(5,290)
Dividends—Series A preferred stock	(12,000)	(12,000)	(11,900)
Repurchases of common stock	(50,000)	0	(85,926)
Other	(259)	(385)	1,856
Cash used in financing activities	(65,370)	(16,443)	(101,260)
Effect of exchange rate changes on cash and cash equivalents	2,641	(430)	(13,982)
Net change in cash and cash equivalents	24,563	4,224	(124,171)
Cash and cash equivalents—beginning of year	147,565	143,341	267,512
Cash and cash equivalents—end of year	172,128	147,565	143,341
Supplemental disclosure of cash flow information—cash paid during the period for:
Cash paid for interest	434	653	917
Cash paid for income taxes	$ 13,208	$ 12,344	$ 19,923