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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current tax provision (benefit):      
U.S. federal $ 556 $ 23 $ (310)
State 1,415 (654) 938
Total current 1,971 (631) 628
Deferred tax provision (benefit):      
U.S. federal 48,450 (23,786) (18,397)
State 2,768 (3,649) (71)
Total deferred 51,218 (27,435) (18,468)
Provision for (benefit from) income taxes $ 53,189 $ (28,066) $ (17,840)