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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Payments to Acquire Restricted Certificates of Deposit $ (50,000,000) $ 0 $ 0
Cash flows from operating activities:      
Net Income (loss) (36,137,000) (90,287,000) (130,425,000)
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 59,768,000 69,618,000 88,704,000
Mining asset impairment 0 0 23,242,000
Mining inventory writedown 0 0 16,690,000
Deferred income tax provision (680,000) 27,969,000 (24,800,000)
Noncash goodwill impairment charge 0 0 36,571,000
Stock-based compensation 1,993,000 2,335,000 5,360,000
Excess tax benefit from stock-based compensation 0 0 672,000
Issuance of treasury stock under 401(k) plan 518,000 583,000 639,000
Non-cash foreign currency translation loss 9,734,000 12,058,000 8,829,000
(Increase) decrease in assets:      
Accounts receivable 4,007,000 497,000 54,686,000
Inventories 4,374,000 31,333,000 20,933,000
Prepaid and other current assets (16,718,000) 9,946,000 30,324,000
Other assets (109,000) (4,780,000) (1,145,000)
Increase (decrease) in liabilities:      
Accounts payable 20,953,000 1,402,000 (26,135,000)
Other current liabilities 3,635,000 (172,000) (2,089,000)
Other liabilities (7,838,000) 3,428,000 15,764,000
Net cash provided by operating activities 43,500,000 63,930,000 117,820,000
Cash flows from investing activities:      
Capital expenditures (41,948,000) (48,429,000) (58,439,000)
Acquisitions, net of cash acquired 0 0 (13,395,000)
Increase (Decrease) in Restricted Cash 0 0 14,268,000
Other 2,222,000 (1,508,000) 1,296,000
Net cash used for investing activities (89,726,000) (49,937,000) (56,270,000)
Cash flows from financing activities:      
Proceeds from borrowings 17,285,000 5,727,000 15,708,000
Payment on debt (22,634,000) (5,521,000) (60,345,000)
Proceeds from exercise of stock options 13 145,000 141,000
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation 0 0 (672,000)
Payment of financing fees 0 0 (33,000)
Dividends paid (1,081,000) (1,077,000) (1,073,000)
Net cash provided by (used for) financing activities (6,430,000) (726,000) (46,274,000)
Effect of exchange rate changes on cash 295,000 (14,530,000) (3,185,000)
Net increase (decrease) in cash and cash equivalents (52,361,000) (1,263,000) 12,091,000
Cash and cash equivalents at beginning of period 200,188,000 201,451,000 189,360,000
Cash and cash equivalents at end of period 147,827,000 200,188,000 201,451,000
Supplemental Cash Flow Information [Abstract]      
Interest paid 34,380,000 34,072,000 34,014,000
Income Taxes Paid, Net $ 5,463,000 $ (195,000) $ (25,588,000)