Stockholders' Equity (Distribution of REIT Taxable Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Common and preferred dividends	$ 142,940	$ 107,167	$ 99,138
Dividends treated as taxable compensation	(161)	(150)	(129)
Dividends applied to meet current year REIT distribution requirements	$ 142,779	$ 107,017	$ 99,009