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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income (loss) $ (30,019) $ 42,245
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 46,815 40,031
Amortization of debt premium 0 (1,202)
Mining asset impairment 23,242 0
Mining inventory writedown 11,555 0
Deferred income tax provision (18,269) 9,213
Convertible debt conversion charge 0 7,273
Gain on earthquake insurance recovery 0 (22,451)
Stock-based compensation 2,143 2,800
Excess tax benefit from stock options exercised 45 42
Insurance proceeds 0 35,808
Issuance of treasury stock under 401(k) plan 332 326
(Increase) decrease in assets:    
Accounts receivable (28,989) (48,349)
Inventories (3,046) (14,599)
Prepaid and other current assets 36,061 (15,634)
Other assets (4,050) 4,818
Increase (decrease) in liabilities:    
Accounts payable 15,017 42,014
Other current liabilities 4,937 (402)
Other liabilities (12,719) 4,677
Net cash provided by operating activities 43,055 86,610
Cash flows from investing activities:    
Capital expenditures (30,883) (36,068)
Acquisition of additional interest (13,395) (1,671)
Additional equity investment in Wheels India 0 (8,017)
Decrease in restricted cash deposits 14,268 0
Insurance proceeds 0 2,879
Other 3,241 179
Net cash used for investing activities (26,769) (42,698)
Cash flows from financing activities:    
Proceeds from borrowings 0 345,313
Payment on debt (53,393) (155,082)
Term loan borrowing 6,217 25,157
Convertible note conversion 0 (14,090)
Proceeds from exercise of stock options 141 841
Excess tax benefit from stock options exercised (45) (42)
Payment of financing fees (33) (5,452)
Dividends paid (536) (511)
Net cash provided by (used for) financing activities (47,649) 196,134
Effect of exchange rate changes on cash 4,957 (4,773)
Net increase (decrease) in cash and cash equivalents (26,406) 235,273
Cash and cash equivalents, beginning of period 189,360 189,114
Cash and cash equivalents, end of period 162,954 424,387
Supplemental Cash Flow Information [Abstract]    
Interest paid 20,695 16,375
Income taxes paid 6,454 37,207
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]    
Issuance of common stock for convertible debt payment $ 0 $ 45,903