Summary of Significant Accounting Policies - Earnings Per Share (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
Numerator:
Net income	$ 45,414	$ 33,545	$ 45,918	$ 17,916	$ 77,756	$ 91,586	$ 51,262	$ 38,455	$ 142,793	$ 259,059	$ 153,004
Income from consolidated joint venture attributable to noncontrolling interest									(7,060)	(8,614)	(7,628)
Preferred stock dividends									(12,830)	(12,830)	(12,830)
Distributions paid on unvested restricted stock compensation									(901)	(814)	(860)
Undistributed income allocated to unvested restricted stock compensation										(422)
Numerator for basic and diluted income attributable to common stockholders									$ 122,002	$ 236,379	$ 131,686
Denominator:
Weighted average basic and diluted common shares outstanding (in shares)									225,681	225,924	221,898
Basic and diluted income attributable to common stockholders per common share (in dollars per share)	$ 0.18	$ 0.12	$ 0.18	$ 0.06	$ 0.32	$ 0.38	$ 0.20	$ 0.15	$ 0.54	$ 1.05	$ 0.59