Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Accumulated amortization of intangible assets	$ 18,461	$ 17,330
Accumulated amortization of lease costs	4,893	4,286
Accumulated amortization of financing costs	$ 551	$ 356
Common stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	300,000,000	200,000,000
Common Stock, shares issued	98,301,000	98,054,000
Common Stock, shares outstanding	98,301,000	98,054,000
Excess Stock, par value	$ 0.01	$ 0.01
Excess Stock, shares authorized	200,000,000	200,000,000
Excess Stock, shares issued	0	0
Excess Stock, shares outstanding	0	0
Series C Preferred Stock [Member]
Cumulative redeemable preferred, stock dividend rate	6.125%	6.125%
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	26,600,000	21,900,000
Preferred stock, shares issued	21,986,000	18,880,000
Preferred stock, shares outstanding	21,986,000	18,880,000