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Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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 Disclosure [Abstract]
Revenue	$ 128,888	$ 145,338	$ 98,468	$ 106,802	$ 140,165	$ 122,141	$ 171,571	$ 364,245	$ 479,496	$ 798,122	$ 679,202
Net income (loss)	(36,022)	3,626	373,691	(6,970)	(105,028)	(8,832)	60,506	35,028	334,325	(18,326)	180,208
Net income (loss) attributable to common shareholders	(38,137)	781	370,839	(9,441)	(107,332)	(10,860)	50,997	34,933	324,042	(32,262)	175,682
Net income (loss) attributable to common shareholders
Basic	(46,260)	(7,343)	362,715	(17,565)	(115,455)	(18,984)	42,873	26,809	291,547	(64,757)	110,924
Diluted	$ (46,260)	$ (7,343)	$ 364,965	$ (17,565)	$ (115,455)	$ (18,984)	$ 45,123	$ 29,059	$ 300,547	$ (64,757)	$ 110,924
Earnings per share
Basic (in dollars per share)	$ (0.71)	$ (0.12)	$ 5.67	$ (0.26)	$ (1.70)	$ (0.28)	$ 0.63	$ 0.39	$ 4.51	$ (0.95)	$ 1.56
Diluted (in dollars per share)	$ (0.71)	$ (0.12)	$ 4.55	$ (0.26)	$ (1.70)	$ (0.28)	$ 0.54	$ 0.35	$ 3.73	$ (0.95)	$ 1.56
Weighted average number of common shares
Basic (in shares)	64,910	62,168	64,019	67,747	68,012	67,975	67,932	67,913	64,696	67,958	71,021
Diluted (in shares)	64,910	62,168	80,259	67,747	68,012	67,975	83,694	83,670	80,666	67,958	71,021

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