CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited - 9 months ended Sep. 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	80,723	0	0	80,285	0	438
Net unrealized change in fair value of interest rate swaps	(6,253)	0	0	0	(6,253)	0
Common dividends declared - $1.82 per share	(59,691)	0	0	(59,691)	0	0
Stock-based compensation, net of forfeitures	5,016	0	5,016	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 2,564 shares of common stock, dividend reinvestment plan	172	0	172	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	(550)	0	0	0	0	(550)
BALANCE at Sep. 30, 2016	$ 605,030	$ 3	$ 918,807	$ (308,298)	$ (9,709)	$ 4,227