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INCOME TAXES - Reconciliation of the Tax Provision (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
INCOME TAXES |  |  |
Loss before income taxes | $ (45,010) | $ (419,113) | $ (201,107)
Statutory tax rate (as a percent) | 34.00% | 34.00% | 34.00%
US Federal and State tax recovery at statutory rate | $ (15,303) | $ (142,498) | $ (68,376)
Reconciling items: |  |  |
Equity pickup in MSC | (821) | 1,850 | (2,924)
Prior year true ups/acquisitions | 906 | 8,330 | (19,016)
Adjustment for foreign tax rates | (1,230) | (1,803) | 6,573
Other permanent differences | (15,694) | (14,760) | (11,296)
Unrealized foreign exchange rate (loss)/gain | 9,389 | 19,444 | (28,319)
NOL expired | 1,215 | 10,268 | 1,711
Valuation allowance | (7,026) | 4,592 | 34,725
Income tax recovery | $ 24,560 | $ 107,170 | $ 53,365

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