Annual report pursuant to Section 13 and 15(d)

Components of Income Tax Expense (Benefit) (Details)

v3.8.0.1
Components of Income Tax Expense (Benefit) (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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Subsequent Event [Line Items]                        
Current federal tax provision (benefit)                   $ 492 $ (1,616) $ (4,097)
Current state tax provision (benefit)                   57 164 175
Total current tax provision (benefit)                   549 (1,452) (3,922)
Deferred tax (benefit) provision                   (11,031) 13,766 (12,638)
(Benefit from) provision for income taxes $ 10,618 $ (5,342) $ 8,759 $ (24,517) $ 38,443 $ (16,825) $ (14,761) $ 5,458   $ (10,482) $ 12,314 $ (16,560)
Federal income tax rate applicable to corporations                   35.00% 35.00% 35.00%
Subsequent Event [Member]                        
Subsequent Event [Line Items]                        
Federal income tax rate applicable to corporations                 21.00%