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Income Taxes - Provision (Benefit) for Income Tax Attributable to Income (Loss) from Continuing Operations before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
Federal $ 91,343 $ (109,565) $ 21,773
State 6,715 5,339 1,646
Total current taxes 98,058 (104,226) 23,419
Deferred:      
Federal 8,296 147,797 (107,651)
State 5,725 196 (1,929)
Total deferred taxes 14,021 147,993 (109,580)
Total income tax expense (benefit) $ 112,079 $ 43,767 $ (86,161)