CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited - 6 months ended Jun. 30, 2015 - 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, 2014	$ 575,615	$ 3	$ 874,335	$ (300,852)	$ (2,357)	$ 4,486
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,724	0	0	24,463	0	261
Net unrealized change in fair value of interest rate swaps	587	0	0	0	587	0
Common dividends declared - $1.14 per share	(37,003)	0	0	(37,003)	0	0
Stock-based compensation, net of forfeitures	4,709	0	4,709	0	0	0
Issuance of 1,688 shares of common stock, common stock offering, net of expenses	52	0	52	0	0	0
Issuance of 2,160 shares of common stock, dividend reinvestment plan	126	0	126	0	0	0
Withheld 32,409 shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock	(2,041)	0	(2,041)	0	0	0
Distributions to noncontrolling interest	(347)	0	0	0	0	(347)
BALANCE at Jun. 30, 2015	$ 566,422	$ 3	$ 877,181	$ (313,392)	$ (1,770)	$ 4,400