Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2018
Interest and Debt Expense [Abstract]
Interest incurred on debt	$ 24,092	$ 32,120
Accretion of fair value adjustment on Senior Notes	549	549
Amortization of debt issuance costs	1,031	1,031
Total interest expense	$ 25,672	$ 33,700	$ 33,700