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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net loss $ (64,079,000) $ (39,755,000) $ (89,828,000)
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 58,444,000 59,768,000 69,618,000
Asset impairment 9,917,000 0 0
Deferred income tax provision 785,000 (680,000) 24,444,000
Loss on senior note repurchase (18,646,000) 0 0
Stock-based compensation 1,539,000 1,993,000 2,335,000
Issuance of treasury stock under 401(k) plan 540,000 518,000 583,000
Foreign currency translation loss 5,258,000 9,734,000 12,058,000
(Increase) decrease in assets:      
Accounts receivable (38,478,000) 4,007,000 497,000
Inventories (55,562,000) 7,992,000 34,399,000
Prepaid and other current assets 9,277,000 (16,718,000) 9,946,000
Other long-term assets 15,134,000 (109,000) (4,780,000)
Increase (decrease) in liabilities:      
Accounts payable 37,584,000 20,953,000 1,402,000
Other current liabilities 9,522,000 3,635,000 (172,000)
Other liabilities (9,816,000) (7,838,000) 3,428,000
Net cash provided by (used for) operating activities (1,289,000) 43,500,000 63,930,000
Cash flows from investing activities:      
Capital expenditures (32,626,000) (41,948,000) (48,429,000)
Proceeds from Sale and Maturity of Marketable Securities 50,000,000    
Payments to Acquire Restricted Certificates of Deposit   50,000,000 0
Other 993,000 2,222,000 (1,508,000)
Net cash provided by (used for) investing activities 18,367,000 (89,726,000) (49,937,000)
Cash flows from financing activities:      
Proceeds from borrowings 447,639,000 17,285,000 5,727,000
Repurchase of senior secured notes 415,395,000 0 0
Payment on debt (55,160,000) (22,634,000) (5,521,000)
Proceeds from exercise of stock options 0 0 145,000
Dividends paid (1,167,000) (1,081,000) (1,077,000)
Net cash used for financing activities (24,083,000) (6,430,000) (726,000)
Effect of exchange rate changes on cash 2,748,000 295,000 (14,530,000)
Net decrease in cash and cash equivalents (4,257,000) (52,361,000) (1,263,000)
Cash and cash equivalents, beginning of year 147,827,000 200,188,000 201,451,000
Cash and cash equivalents, end of year 143,570,000 147,827,000 200,188,000
Supplemental Cash Flow Information [Abstract]      
Interest paid 38,164,000 34,380,000 34,072,000
Income taxes paid, net of refunds received 4,594,000 5,463,000 (195,000)
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]      
Issuance of common stock for convertible debt payment $ 58,460,000 $ 0 $ 0