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Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
Federal $ (16,729) $ 7,434 $ 15,579
State 933 5,351 4,855
Foreign 0 0 (10)
Current Income Tax Expense (Benefit) (15,796) 12,785 20,424
Deferred      
Federal (36,810) 15,573 13,006
State (3,779) 2,754 3,075
Deferred tax expense (40,589) 18,327 16,081
Income tax provision $ (56,385) $ 31,112 $ 36,505