CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited - 9 months ended Sep. 30, 2017 - 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, 2016	$ 641,866	$ 3	$ 949,318	$ (313,655)	$ 1,995	$ 4,205
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	65,922	0	0	65,593	0	329
Net unrealized change in fair value of cash flow hedges	650	0	0	0	650	0
Common dividends declared - $1.88 per share	(64,330)	0	0	(64,330)	0	0
Stock-based compensation, net of forfeitures	5,653	0	5,653	0	0	0
Issuance of 1,037,605 shares of common stock, common stock offering, net of expenses	78,956	0	78,956	0	0	0
Issuance of 2,097 shares of common stock, dividend reinvestment plan	170	0	170	0	0	0
Withheld 33,695 shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock	(2,505)	0	(2,505)	0	0	0
Distributions to noncontrolling interest	(308)	0	0	0	0	(308)
Contributions from noncontrolling interest	100	0	0	0	0	100
BALANCE at Sep. 30, 2017	$ 726,174	$ 3	$ 1,031,592	$ (312,392)	$ 2,645	$ 4,326