CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Distributions In Excess Of Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interest in Joint Ventures
BALANCE at Dec. 31, 2015	$ 559,201	$ 3	$ 887,207	$ (328,892)	$ (3,456)	$ 4,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	65,923	0	0	65,624	0	299
Net unrealized change in fair value of interest rate swaps	(8,859)	0	0	0	(8,859)	0
Common dividends declared - $1.20 per share	(39,272)	0	0	(39,272)	0	0
Stock-based compensation, net of forfeitures	4,309	0	4,309	0	0	0
Issuance of 447,665 shares of common stock, common stock offering, net of expenses	29,643	0	29,643	0	0	0
Issuance of 1,798 shares of common stock, dividend reinvestment plan	115	0	115	0	0	0
Withheld 57,316 shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock	(3,231)	0	(3,231)	0	0	0
Distributions to noncontrolling interest	(340)	0	0	0	0	(340)
BALANCE at Jun. 30, 2016	$ 607,489	$ 3	$ 918,043	$ (302,540)	$ (12,315)	$ 4,298