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Quarterly Results of Operations - Schedule of Quarterly Financial Information (Details) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                              
Impairment of assets $ 6,000       $ 4,000   $ 1,600   $ 6,200 $ 1,400     $ 6,040 $ 5,570 $ 7,639
Gain on sale of business and assets 400 $ 300 $ 1,100 $ 1,200     $ 1,600           2,966 (2,162) 838
Gain on insurance $ 900 $ 100                     (288) (20)
Effective income tax expense (benefit) rate (371.70%) 24.10% 22.30% 22.00% 103.80% 25.30% 24.20% (134.30%) 99.60% 32.90% 33.70% 33.30%      
Deferred income tax benefit               $ 8,800 $ 1,300       $ 821 $ (6,775) $ 2,273
Deferred income tax benefit, gross               $ 9,700              
Deferred tax expense         $ 827   $ 38