CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	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, 2017	$ 751,130	$ 3	$ 1,061,153	$ (317,032)	$ 5,348	$ 1,658
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,748	0	0	28,713	0	35
Net unrealized change in fair value of cash flow hedges	3,606	0	0	0	3,606	0
Common dividends declared - $.64 per share	(22,388)	0	0	(22,388)	0	0
Stock-based compensation, net of forfeitures	1,044	0	1,044	0	0	0
Issuance of 179,501 shares of common stock, common stock offering, net of expenses	14,602	0	14,602	0	0	0
Issuance of 667 shares of common stock, dividend reinvestment plan	54	0	54	0	0	0
Withheld 23,824 shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock	(2,055)	0	2,055	0	0	0
Distributions to noncontrolling interest	(65)	0	0	0	0	(65)
BALANCE at Mar. 31, 2018	$ 774,676	$ 3	$ 1,074,798	$ (310,707)	$ 8,954	$ 1,628