Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Income Tax Expense (Benefit) (Details)

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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current $ 288 $ 301 $ (2,146)
Deferred (203,272) (4,760) 30,920
Income tax expense (benefit) $ (202,984) $ (4,459) $ 28,774