Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information
Revenue	$ 239,067	$ 243,795	$ 255,618	$ 54,108	$ 43,492	$ 37,816	$ 33,145	$ 28,453
Total operating expenses	431,670	577,884	138,027	43,500	11,979	10,803	11,509	9,560	$ 1,191,081	$ 43,851	$ 41,134
Operating income	(192,603)	(334,089)	117,591	10,608					(398,493)	(43,851)	(41,134)
Net income and comprehensive income	$ (144,559)	$ (289,477)	$ 69,274	$ 9,648	21,388	18,028	14,387	12,805	$ (355,114)	66,608	2,325
Net income attributable to Series B units					(3,719)	(598)	(506)	(413)		$ (5,236)	$ (784)
Net income attributable to common shareholders					$ 17,669	$ 17,430	$ 13,881	$ 12,392
Net income (loss) per share-basic and diluted	$ (0.29)	$ (0.57)	$ 0.14	$ 0.04	$ 0.10	$ 0.09	$ 0.07	$ 0.07	$ (0.80)	$ 0.33	$ 0.03