CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited - USD ($)	Total	Common Stock	Additional Paid-in Capital	Distributions In Excess Of Earnings	Accumulated Other Comprehensive Income	Noncontrolling Interest in Joint Ventures
BALANCE at Dec. 31, 2018	$ 904,703,000	$ 4,000	$ 1,222,547,000	$ (326,193,000)	$ 6,701,000	$ 1,644,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	22,534,000	0	0	22,529,000	0	5,000
Net unrealized change in fair value of cash flow hedges	(2,313,000)	0	0	0	(2,313,000)	0
Common dividends declared	(26,520,000)	0	0	(26,520,000)	0	0
Stock-based compensation, net of forfeitures	1,447,000	0	1,447,000	0	0	0
Issuance of common stock, common stock offering, net of expenses	24,400,000	0	24,400,000	0	0	0
Issuance of common stock, dividend reinvestment plan	54,000	0	54,000	0	0	0
Withheld shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock	(2,788,000)	0	(2,788,000)	0	0	0
Distributions to noncontrolling interest	(43,000)	0	0	0	0	(43,000)
BALANCE at Mar. 31, 2019	921,474,000	4,000	1,245,660,000	(330,184,000)	4,388,000	1,606,000
BALANCE at Dec. 31, 2019	1,202,329,000	4,000	1,514,055,000	(316,302,000)	2,807,000	1,765,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	23,298,000	0	0	23,297,000	0	1,000
Net unrealized change in fair value of cash flow hedges	(15,790,000)	0	0	0	(15,790,000)	0
Common dividends declared	(29,366,000)	0	0	(29,366,000)	0	0
Stock-based compensation, net of forfeitures	1,781,000	0	1,781,000	0	0	0
Issuance of common stock, common stock offering, net of expenses	14,734,000	0	14,734,000	0	0	0
Withheld shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock	(4,589,000)	0	(4,589,000)	0	0	0
Distributions to noncontrolling interest	(34,000)	0	0	0	0	(34,000)
BALANCE at Mar. 31, 2020	$ 1,192,363,000	$ 4,000	$ 1,525,981,000	$ (322,371,000)	$ (12,983,000)	$ 1,732,000