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INCOME TAXES - Reconciliation of Tax Provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
INCOME TAXES.      
Income (loss) before income taxes $ 17,306 $ (45,010) $ (419,113)
Statutory tax rate (as a percent) 34.00% 34.00% 34.00%
US Federal and State tax recovery at statutory rate $ 5,884 $ (15,303) $ (142,498)
Reconciling items:      
Equity pickup in MSC (4,533) (821) 1,850
Impairment of MSC   4,004 7,407
Revisions to prior year estimates (828) 906 8,330
Adjustment for foreign tax rates (501) (1,230) (1,803)
Other permanent differences 818 (15,694) (14,760)
Unrealized foreign exchange rate (loss)/gain 5,972 9,389 19,444
NOL expired 586 1,215 10,268
Valuation allowance (11,147) (7,026) 4,592
Tax Recovery $ (3,749) $ (24,560) $ (107,170)