Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (34,221)	$ (34,221)	$ 34,810	$ 34,810	$ (34,221)	$ 34,810
Other comprehensive income, net of tax:
Net derivative loss reclassified into earnings	0		184		0	184
Other comprehensive income	0		184		0	184
Total comprehensive income (loss)	$ (34,221)		$ 34,994		$ (34,221)	$ 34,994