Condensed Consolidated Statements of Equity (Unaudited) Statement - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Cumulative Net Income	Cumulative Dividends
Beginning balance at Dec. 31, 2020	$ 1,948,376	$ 1,395	$ 3,635,341	$ (17,832)	$ 1,199,499	$ (2,870,027)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs	63,085	21	63,064
Common stock redemptions	(1,556)	(1)	(1,555)
Share-based compensation	3,019	2	3,017
Net income	24,022				24,022
Reclassification adjustments for losses included in net income (interest expense)	1,095			1,095
Gains arising during the period on interest rate swaps	2,850			2,850
Dividends to common stockholders (in usd per share)	(42,782)					(42,782)
Ending balance at Mar. 31, 2021	1,998,109	1,417	3,699,867	(13,887)	1,223,521	(2,912,809)
Beginning balance at Dec. 31, 2021	2,185,116	1,505	3,972,917	(9,981)	1,266,158	(3,045,483)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs	22,661	7	22,654
Common stock redemptions	(206)		(206)
Share-based compensation	3,699	4	3,695
Net income	42,227				42,227
Reclassification adjustments for losses included in net income (interest expense)	1,086			1,086
Gains arising during the period on interest rate swaps	5,159			5,159
Dividends to common stockholders (in usd per share)	(46,860)					(46,860)
Ending balance at Mar. 31, 2022	$ 2,212,882	$ 1,516	$ 3,999,060	$ (3,736)	$ 1,308,385	$ (3,092,343)