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, 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	72,058,000
Net unrealized change in fair value of cash flow hedges	(6,323,000)
BALANCE at Sep. 30, 2019	1,108,670,000	4,000	1,442,745,000	(336,645,000)	378,000	2,188,000
BALANCE at Mar. 31, 2019	921,474,000	4,000	1,245,660,000	(330,184,000)	4,388,000	1,606,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	26,949,000	0	0	26,953,000	0	(4,000)
Net unrealized change in fair value of cash flow hedges	(3,754,000)	0	0	0	(3,754,000)	0
Common dividends declared	(27,106,000)	0	0	(27,106,000)	0	0
Stock-based compensation, net of forfeitures	2,291,000	0	2,291,000	0	0	0
Issuance of common stock, common stock offering, net of expenses	89,036,000	0	89,036,000	0	0	0
Issuance of common stock, dividend reinvestment plan	55,000	0	55,000	0	0	0
Distributions to noncontrolling interest	(43,000)	0	0	0	0	(43,000)
BALANCE at Jun. 30, 2019	1,008,902,000	4,000	1,337,042,000	(330,337,000)	634,000	1,559,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	22,575,000	0	0	22,571,000	0	4,000
Net unrealized change in fair value of cash flow hedges	(256,000)	0	0	0	(256,000)	0
Common dividends declared	(28,879,000)	0	0	(28,879,000)	0	0
Stock-based compensation, net of forfeitures	1,739,000	0	1,739,000	0	0	0
Issuance of common stock, common stock offering, net of expenses	103,911,000	0	103,911,000	0	0	0
Issuance of common stock, dividend reinvestment plan	53,000	0	53,000	0	0	0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	668,000	0	0	0	0	668,000
Distributions to noncontrolling interest	(43,000)	0	0	0	0	(43,000)
BALANCE at Sep. 30, 2019	1,108,670,000	4,000	1,442,745,000	(336,645,000)	378,000	2,188,000
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
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	71,196,000
Net unrealized change in fair value of cash flow hedges	(16,252,000)
BALANCE at Sep. 30, 2020	1,244,618,000	4,000	1,591,720,000	(335,359,000)	(13,445,000)	1,698,000
BALANCE at Mar. 31, 2020	1,192,363,000	4,000	1,525,981,000	(322,371,000)	(12,983,000)	1,732,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	23,487,000	0	0	23,484,000	0	3,000
Net unrealized change in fair value of cash flow hedges	(1,824,000)	0	0	0	(1,824,000)	0
Common dividends declared	(29,551,000)	0	0	(29,551,000)	0	0
Stock-based compensation, net of forfeitures	2,694,000	0	2,694,000	0	0	0
Issuance of common stock, common stock offering, net of expenses	29,647,000	0	29,647,000	0	0	0
Distributions to noncontrolling interest	(19,000)	0	0	0	0	(19,000)
BALANCE at Jun. 30, 2020	1,216,797,000	4,000	1,558,322,000	(328,438,000)	(14,807,000)	1,716,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	24,411,000	0	0	24,401,000	0	10,000
Net unrealized change in fair value of cash flow hedges	1,362,000	0	0	0	1,362,000	0
Common dividends declared	(31,322,000)	0	0	(31,322,000)	0	0
Stock-based compensation, net of forfeitures	2,036,000	0	2,036,000	0	0	0
Issuance of common stock, common stock offering, net of expenses	31,362,000	0	31,362,000	0	0	0
Distributions to noncontrolling interest	(28,000)	0	0	0	0	(28,000)
BALANCE at Sep. 30, 2020	$ 1,244,618,000	$ 4,000	$ 1,591,720,000	$ (335,359,000)	$ (13,445,000)	$ 1,698,000