Business Combinations - Pro Forma Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Business Combinations [Abstract]
Total Revenues	$ 37,259	$ 25,406	$ 60,273	$ 54,955
Pro Forma Net Income (Loss) from Continuing Operations	(16,877)	75,053	(23,364)	64,999
Pro Forma Net Income (Loss) from Discontinued Operations	(25)	19	25	(18,133)
Pro Forma Net Income (Loss) before Taxes	(16,902)	75,072	(23,339)	46,866
Pro forma income tax benefit (expense)	3,549	(15,765)	4,901	(9,842)
Pro Forma Net Income (Loss)	$ (13,353)	$ 59,307	$ (18,438)	$ 37,024
Net Income (Loss) per Share/Unit from Continuing Operations, Basic (USD per share)	$ (960)	$ 4,340	$ (1,330)	$ 3,770
Net Income (Loss) per Share/Unit from Continuing Operations, Diluted (USD per share)	(960)	4,320	(1,330)	3,760
Net Income (Loss) per Share/Unit from Discontinued Operations, Basic (USD per share)	0	0	0	(1,050.00)
Net Income (Loss) per Share/Unit from Discontinued Operations, Diluted (USD per share)	$ 0	$ 0	$ 0	$ (1,050.00)