Consolidated Statements of Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Distributions In Excess of Earnings	Treasury Stock	Noncontrolling Interests	Total
Balance at Dec. 31, 2014	$ 98	$ 1,824,381		$ (460,623)	$ (4,901)	$ 861	$ 1,359,816
Balance (in shares) at Dec. 31, 2014	97,581,598
Increase (Decrease) in Stockholders' Equity
Contributions from noncontrolling interests						110	110
Distributions to noncontrolling interests						(32)	(32)
Stock-based compensation expense		366					366
Issuance of shares pursuant to employment agreement or Stock-based compensation expense (in shares)	2,000
Common dividends				(21,346)			(21,346)
Net income				2,732			2,732
Balance at Mar. 31, 2015	$ 98	1,824,747		(479,237)	$ (4,901)	939	1,341,646
Balance (in shares) at Mar. 31, 2015	97,583,598
Balance at Dec. 31, 2015	$ 98	1,820,451	$ (2,519)	(521,620)		937	1,297,347
Balance (in shares) at Dec. 31, 2015	97,589,598
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		32					32
Issuance of shares pursuant to employment agreement or Stock-based compensation expense (in shares)	76,423
Common dividends				(21,365)			(21,365)
Other comprehensive income (loss)			(7,925)				(7,925)
Net income				26,980		3	26,983
Balance at Mar. 31, 2016	$ 98	$ 1,820,483	$ (10,444)	$ (516,005)		$ 940	$ 1,295,072
Balance (in shares) at Mar. 31, 2016	97,666,021