CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited - 6 months ended Jun. 30, 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	47,012	0	0	46,940	0	72
Net unrealized change in fair value of cash flow hedges	4,792	0	0	0	4,792	0
Common dividends declared - $1.28 per share	(45,263)	0	0	(45,263)	0	0
Stock-based compensation, net of forfeitures	2,929	0	2,929	0	0	0
Issuance of 929,783 shares of common stock, common stock offering, net of expenses	82,156	1	82,155	0	0	0
Issuance of 1,232 shares of common stock, dividend reinvestment plan	108	0	108	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	(108)	0	0	0	0	(108)
BALANCE at Jun. 30, 2018	$ 840,701	$ 4	$ 1,144,290	$ (315,355)	$ 10,140	$ 1,622