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Income Taxes - Current and Deferred Tax Positions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal $ 0 $ (1,495) $ 0
State 912 172 352
Total current 912 (1,323) 352
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 6,197 (67,443) (21,287)
State (959) 7,683 (3,669)
Total deferred 5,238 (59,760) (24,956)
Provision for (benefit from) income taxes $ 6,150 $ (61,083) $ (24,604)