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CONSOLIDATED STATEMENTS OF CASH FLOWS - Entity [Domain] - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net loss $ 3,220 $ (30,019)
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 36,604 46,815
Mining asset impairment 0 23,242
Mining inventory writedown 0 11,555
Deferred income tax provision (5,602) (18,269)
Stock-based compensation 1,339 2,143
Excess tax benefit from stock-based compensation 538 45
Issuance of treasury stock under 401(k) plan 304 332
(Increase) decrease in assets:    
Accounts receivable (37,149) (28,989)
Inventories 8,721 (3,046)
Prepaid and other current assets 2,868 36,061
Other assets (688) (4,050)
Increase (decrease) in liabilities:    
Accounts payable 4,423 15,017
Other current liabilities (1,988) 4,937
Other liabilities (4,748) (12,719)
Net cash provided by (used for) operating activities 7,842 43,055
Cash flows from investing activities:    
Capital expenditures (22,505) (30,883)
Acquisition of additional interest 0 (13,395)
Decrease in restricted cash deposits 0 14,268
Other 2,708 3,241
Net cash used for investing activities (19,797) (26,769)
Cash flows from financing activities:    
Proceeds from borrowings 13,239 6,217
Payment on debt (8,517) (53,393)
Proceeds from exercise of stock options 144 141
Excess tax benefit from stock-based compensation (538) (45)
Payment of financing fees 0 (33)
Dividends paid (538) (536)
Net cash provided by financing activities 3,790 (47,649)
Effect of exchange rate changes on cash (5,802) 4,957
Net increase (decrease) in cash and cash equivalents (13,967) (26,406)
Cash and cash equivalents, beginning of period 201,451 189,360
Cash and cash equivalents, end of period 187,484 162,954
Supplemental Cash Flow Information [Abstract]    
Interest paid 20,063 20,695
Income taxes paid $ (884) $ 6,454