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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net loss $ (34,392) $ (47,036)
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 52,981 67,789
Mining asset impairment 0 23,242
Mining inventory writedown 0 11,555
Deferred income tax provision (8,578) (15,218)
Stock-based compensation 1,754 3,165
Excess tax benefit from stock-based compensation 758 51
Issuance of treasury stock under 401(k) plan 455 504
(Increase) decrease in assets:    
Accounts receivable (8,531) 13,636
Inventories 13,486 (6,057)
Prepaid and other current assets 4,397 21,923
Other assets 1,340 (3,549)
Increase (decrease) in liabilities:    
Accounts payable 4,646 (5,457)
Other current liabilities (750) 7,376
Other liabilities 2,970 5,423
Net cash provided by operating activities 30,536 77,347
Cash flows from investing activities:    
Capital expenditures (35,213) (46,329)
Acquisition of additional interest 0 (13,395)
Decrease in restricted cash deposits 0 14,268
Other 4,317 4,610
Net cash used for investing activities (30,896) (40,846)
Cash flows from financing activities:    
Proceeds from borrowings 14,566 14,914
Payment on debt (11,382) (60,359)
Term loan borrowing   14,914
Proceeds from exercise of stock options 144 141
Excess tax benefit from stock-based compensation (758) (51)
Payment of financing fees 0 (33)
Dividends paid (807) (804)
Net cash provided by financing activities 1,763 (46,192)
Effect of exchange rate changes on cash (9,042) 602
Net increase (decrease) in cash and cash equivalents (7,639) (9,089)
Cash and cash equivalents, beginning of period 201,451 189,360
Cash and cash equivalents, end of period 193,812 180,271
Supplemental Cash Flow Information [Abstract]    
Interest paid 19,521 19,280
Income taxes paid $ 395 $ 7,992