Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income attributable to common stockholders	$ (1,293)	$ 7,409	$ (15,155)	$ 35,441
Other comprehensive (loss) income:
Unrealized (loss) gain on derivatives, net of income taxes	(26,109)		(43,122)
Unrealized (loss) gain on derivatives, net of income taxes		5,662		21,833
Interest expense (income) on derivatives recognized into earnings, net of income taxes	21		(968)
Interest expense (income) on derivatives recognized into earnings, net of income taxes		(422)		(1,636)
Other comprehensive (loss) income	(26,088)	5,240	(44,090)	20,197
Comprehensive (loss) income	$ (27,381)	$ 12,649	$ (59,245)	$ 55,638