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Income and Mining Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Examination [Line Items] |  |  |
United States | $ (43,924) | $ (213,883) | $ (242,562)
Foreign | (349,522) | (1,401,245) | (566,117)
Income (loss) before income and mining taxes | (393,446) | (1,615,128) | (808,679)
Income tax provision from continuing operations |  |  |
Income and mining tax benefit (expense) | 26,263 | 428,254 | 158,116
Income and mining tax benefit (expense) at statutory rate | 137,706 | 565,295 | 283,038
State tax provision from continuing operations | (2,075) | 20,253 | 2,245
Change in valuation allowance | (101,027) | (151,191) | (106,802)
Non-deductible imputed interest | 0 | 0 | (214)
Uncertain tax positions | (1,947) | (4,425) | (5,209)
U.S. and foreign non-deductible expenses | 1,365 | (4,892) | (2,383)
Mineral interest related | (19,310) | 0 | 0
Foreign exchange rates | 22,350 | 23,672 | 13,937
Foreign inflation and indexing | 1,117 | 3,765 | 2,937
Foreign tax rate differences | (15,980) | (63,930) | (24,108)
Foreign withholding and other taxes | 8,140 | 82,884 | (100,331)
Foreign tax credits and other, net | (4,076) | (43,177) | 13,153
Mexico permanent reinvestment assertion | 0 | 0 | 81,853
Mexican mining tax | 15,451 | 8,065 |
Inventory | 2,353 | 3,135 |
Foreign subsidiaries — unremitted earnings | 12,999 | 45,249 |
Royalty and other long-term debt | 1,648 | 0 |
Total Deferred Tax Liabilities | 32,451 | 56,449 |
Net operating loss carryforwards | 203,958 | 153,701 |
Mineral properties | 34,966 | 46,006 |
Property, plant, and equipment | 6,980 | 38,091 |
Royalty and other long-term debt | 0 | 5,863 |
Capital loss carryforwards | 3,938 | 35,251 |
Asset retirement obligation | 21,480 | 21,586 |
Unrealized foreign currency loss and other | 8,424 | 8,213 |
Accrued expenses | 17,905 | 9,365 |
Tax credit carryforwards | 26,439 | 56,322 |
Total Deferred Tax Assets | 324,090 | 374,398 |
Valuation allowance | (436,829) | (391,510) |
Deferred Tax Assets, Net of Valuation Allowance | (112,739) | (17,112) |
Net deferred tax liabilities | 145,190 | 73,561 |
Regular net operating losses | 589,277 |  |
Alternative minimum tax net operating losses | 187,376 |  |
Capital losses | 11,195 |  |
Alternative minimum tax credits | 3,173 |  |
Foreign tax credits | 19,898 |  |
Unrecognized tax benefits, beginning of period | 16,084 | 15,471 |
Gross increase to current period tax positions | 1,030 | 1,856 |
Gross increase to prior period tax positions | 810 | 524 |
Reductions in unrecognized tax benefits resulting from a lapse of the applicable statute of limitations | 0 | (1,767) |
Unrecognized tax benefits, end of period | 17,924 | 16,084 | 15,471
United States - Alternative minimum tax [Member] |  |  |
Income tax provision from continuing operations |  |  |
Federal tax expense (benefit) | 49 | 904 | 4
United States - State Mining Taxes [Member] |  |  |
Income tax provision from continuing operations |  |  |
Federal tax expense (benefit) | (4,305) | (879) | (714)
Deferred Federal Income Tax Expense (Benefit) | 1,952 | 0 | 0
United States - Foreign Withholding [Member] |  |  |
Income tax provision from continuing operations |  |  |
Federal tax expense (benefit) | 0 | (6,250) | 397
Argentina [Member] |  |  |
Income tax provision from continuing operations |  |  |
Foreign tax expense (benefit) | 715 | (71) | (137)
Deferred Foreign Income Tax Expense (Benefit) | (1,197) | 24,478 | 8,062
Valuation allowance | (8,376) | (21,520) |
Regular net operating losses | 12,210 |  |
Alternative minimum tax net operating losses | 0 |  |
Capital losses | 0 |  |
Alternative minimum tax credits | 0 |  |
Foreign tax credits | 0 |  |
Australia [Member] |  |  |
Income tax provision from continuing operations |  |  |
Foreign tax expense (benefit) | 130 | 0 | (914)
Deferred Foreign Income Tax Expense (Benefit) | 3,223 | (401) | (2)
Mexico [Member] |  |  |
Income tax provision from continuing operations |  |  |
Foreign tax expense (benefit) | (476) | (10,122) | (9,046)
Deferred Foreign Income Tax Expense (Benefit) | 27,189 | 394,221 | 94,851
Valuation allowance | (63,373) | (14,816) |
Regular net operating losses | 108,191 |  |
Alternative minimum tax net operating losses | 0 |  |
Capital losses | 0 |  |
Alternative minimum tax credits | 0 |  |
Foreign tax credits | 0 |  |
BOLIVIA |  |  |
Income tax provision from continuing operations |  |  |
Foreign tax expense (benefit) | (5,154) | (4,008) | (6,716)
Deferred Foreign Income Tax Expense (Benefit) | 0 | 22,122 | (4,222)
Valuation allowance | (45,177) | (15,948) |
Regular net operating losses | 55,019 |  |
Alternative minimum tax net operating losses | 0 |  |
Capital losses | 0 |  |
Alternative minimum tax credits | 0 |  |
Foreign tax credits | 0 |  |
CANADA |  |  |
Income tax provision from continuing operations |  |  |
Foreign tax expense (benefit) | (516) | (145) | (1,936)
Deferred Foreign Income Tax Expense (Benefit) | 2,875 | 2,662 | 0
Valuation allowance | (1,718) | (2,009) |
Regular net operating losses | 2,182 |  |
Alternative minimum tax net operating losses | 0 |  |
Capital losses | 0 |  |
Alternative minimum tax credits | 0 |  |
Foreign tax credits | 0 |  |
United States [Member] |  |  |
Income tax provision from continuing operations |  |  |
Deferred Federal Income Tax Expense (Benefit) | 1,778 | 5,743 | $ 78,489
Valuation allowance | (292,677) | (305,534) |
Regular net operating losses | 320,511 |  |
Alternative minimum tax net operating losses | 187,376 |  |
Capital losses | 11,195 |  |
Alternative minimum tax credits | 3,173 |  |
Foreign tax credits | 19,898 |  |
Other Countries [Member] |  |  |
Income tax provision from continuing operations |  |  |
Valuation allowance | 0 | (2,973) |
Regular net operating losses | 68 |  |
Alternative minimum tax net operating losses | 0 |  |
Capital losses | 0 |  |
Alternative minimum tax credits | 0 |  |
Foreign tax credits | 0 |  |
NEW ZEALAND |  |  |
Income tax provision from continuing operations |  |  |
Valuation allowance | (25,508) | $ (28,710) |
Regular net operating losses | 91,096 |  |
Alternative minimum tax net operating losses | 0 |  |
Capital losses | 0 |  |
Alternative minimum tax credits | 0 |  |
Foreign tax credits | $ 0 |  |

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