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Segment Information - Reconcilation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (loss) $ 24,814 $ (58,049) $ 54,501 $ (83,377)
Income from asset sales 5,255 14,889 10,820 15,731
Corporate general and administrative costs and corporate depreciation (31,322) (22,512) (63,054) (47,190)
Operating income (loss) from continuing operations (1,253) (65,672) 2,267 (114,836)
Other income (expense):        
Interest and dividend income 1,847 1,338 3,571 2,328
Interest expense (6,028) (6,084) (11,801) (11,139)
Other (121) 174 409 561
Total other income (expense) (4,302) (4,572) (7,821) (8,250)
Loss from continuing operations before income taxes $ (5,555) $ (70,244) $ (5,554) $ (123,086)