Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (19,777)	$ 4,224	$ 22,262	$ 1,862
Other comprehensive (loss) income:
Unrealized (loss) gain on derivative contracts	(8,646)	7,744	(58,695)	57,617
Changes in foreign currency translation		2,547	(63)	2,233
Other comprehensive (loss) income:	(8,646)	10,291	(58,758)	59,850
Comprehensive (loss) income	(28,423)	14,515	(36,496)	61,712
Comprehensive (loss) income attributable to noncontrolling interest	(511)	330	(678)	1,404
Comprehensive (loss) income attributable to common shareholders	$ (27,912)	$ 14,185	$ (35,818)	$ 60,308