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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
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 $ 2,367 $ (1,529) $ (740) $ (12,074) $ (8,289) $ (17,003) $ (2,269) $ (25,292) $ 98 $ (37,366) $ 53,189 $ (28,066) $ (17,840)