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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