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Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:                      
Federal                 $ 215 $ 904 $ 279
State and local                 (963) (1,628) (3,588)
Total current income tax provision                 (748) (724) (3,309)
Deferred federal                 (16,602) 31,029 (30,546)
Deferred state and local                 (2,704) 2,961 (4,029)
Total deferred income tax provision                 (19,306) 33,990 (34,575)
Provision (benefit) for income taxes $ (507) $ (18,776) $ 4,884 $ (5,655) $ 20,799 $ 8,563 $ 5,510 $ (1,606) $ (20,054) $ 33,266 $ (37,884)