Annual report pursuant to Section 13 and 15(d)

Income Taxes Income Taxes (Reconciliation of Statutory Federal Income Tax Amount) (Details)

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Income Taxes Income Taxes (Reconciliation of Statutory Federal Income Tax Amount) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]                      
NET (LOSS) INCOME                 $ (1,480,885) $ 400,744 $ 251,328
Expected income tax at statutory rate                 (518,310) 140,259 87,965
State income taxes                 (15,908) 11,570 9,297
Other differences                 (420) 1,512 874
Changes in valuation allowance                 278,637 0 0
Income tax (benefit) expense recorded $ (36,663) $ (216,603) $ (17,214) $ 14,479 $ 67,757 $ 4,876 $ 31,461 $ 49,247 $ (256,001) $ 153,341 $ 98,136