CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited - 9 months ended Sep. 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	36,821	0	0	36,431	0	390
Net unrealized change in fair value of interest rate swaps	(4,553)	0	0	0	(4,553)	0
Common dividends declared - $1.74 per share	(56,455)	0	0	(56,455)	0	0
Stock-based compensation, net of forfeitures	6,565	0	6,565	0	0	0
Issuance of 106,751 shares of common stock, common stock offering, net of expenses	6,233	0	6,233	0	0	0
Issuance of 3,391 shares of common stock, dividend reinvestment plan	193	0	193	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	(513)	0	0	0	0	(513)
BALANCE at Sep. 30, 2015	$ 561,865	$ 3	$ 885,285	$ (320,876)	$ (6,910)	$ 4,363