CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited - 6 months ended Jun. 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	49,950	0	0	49,709	0	241
Net unrealized change in fair value of interest rate swaps	426	0	0	0	426	0
Common dividends declared - $1.24 per share	(42,270)	0	0	(42,270)	0	0
Stock-based compensation, net of forfeitures	4,275	0	4,275	0	0	0
Issuance of 921,080 shares of common stock, common stock offering, net of expenses	69,105	0	69,105	0	0	0
Issuance of 1,443 shares of common stock, dividend reinvestment plan	113	0	113	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	(214)	0	0	0	0	(214)
Contributions from noncontrolling interest	100	0	0	0	0	100
BALANCE at Jun. 30, 2017	$ 720,846	$ 3	$ 1,020,306	$ (306,216)	$ 2,421	$ 4,332