Stockholders' Equity - Distribution of REIT Taxable Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Common and preferred dividends	$ 176,272	$ 142,940	$ 107,167
Dividends treated as taxable compensation	(167)	(161)	(150)
Dividends applied to meet current year REIT distribution requirements	$ 176,105	$ 142,779	$ 107,017