Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss	$ (27,918)	$ (55,287)	$ (117,500)	$ (162,519)	$ (83,205)	$ (280,019)
Loss from consolidated joint venture attributable to noncontrolling interest	596		2,162		2,571	2,620
Preferred stock dividends and redemption charge	(7,795)		(3,207)		(11,002)	(6,414)
Distributions paid on unvested restricted stock compensation						(69)
Numerator for basic and diluted loss attributable to common stockholders	$ (35,117)		$ (118,545)		$ (91,636)	$ (283,882)
Denominator:
Weighted average basic and diluted common shares outstanding (in shares)	215,113		214,225		214,778	217,631
Basic and diluted loss attributable to common stockholders per common share (in dollars per share)	$ (0.16)		$ (0.55)		$ (0.43)	$ (1.30)