Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 39,547	$ (3,593)	$ 42,039	$ (2,362)
Other comprehensive (loss) income:
Unrealized (loss) gain on derivative contracts	(28,363)	14,605	(50,049)	49,873
Changes in foreign currency translation	(843)	(4,879)	(63)	(314)
Other comprehensive (loss) income:	(29,206)	9,726	(50,112)	49,559
Comprehensive income (loss)	10,341	6,133	(8,073)	47,197
Comprehensive income (loss) attributable to noncontrolling interest	245	134	(167)	1,074
Comprehensive income (loss) attributable to common shareholders	$ 10,096	$ 5,999	$ (7,906)	$ 46,123