Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Distributions in Excess of Earnings	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2015		97,589,598
Beginning balance at Dec. 31, 2015	$ 1,297,347	$ 98	$ 1,820,451	$ (2,519)	$ (521,620)	$ 937
Increase (Decrease) in Stockholders' Equity
Distributions to noncontrolling interests	(36)					(36)
Stock-based compensation expense (in shares)		10,176
Stock-based compensation expense	114		114
Issuance of shares pursuant to employment agreements (in shares)		76,423
Share repurchase (in shares)		(13,628,116)
Share repurchase	(290,134)	$ (14)	(254,547)		(35,573)
Common dividends	(58,930)				(58,930)
Other comprehensive income (loss)	(7,098)			(7,098)
Net income	36,926				36,917	9
Ending balance (in shares) at Sep. 30, 2016		84,048,081
Ending balance at Sep. 30, 2016	978,189	$ 84	1,566,018	(9,617)	(579,206)	910
Increase (Decrease) in Stockholders' Equity
Net income	9,085
Ending balance (in shares) at Sep. 30, 2016		84,048,081
Ending balance at Sep. 30, 2016	978,189	$ 84	1,566,018	(9,617)	(579,206)	910
Beginning balance (in shares) at Dec. 31, 2016		84,048,081
Beginning balance at Dec. 31, 2016	966,589	$ 84	1,566,073	(509)	(599,971)	912
Increase (Decrease) in Stockholders' Equity
Distributions to noncontrolling interests	(37)					(37)
Stock-based compensation expense (in shares)		9,585
Stock-based compensation expense	116		116
Share repurchase (in shares)		(26,181,818)
Share repurchase	(576,000)	$ (26)	(489,027)		(86,947)
Special cash dividends paid to certain common stockholders	(4,872)				(4,872)
Common dividends	(32,854)				(32,854)
Issuance of Warrants	55		55
Dividends to holders of Series A Preferred Stock	(241)				(241)
Other comprehensive income (loss)	1,445			1,445
Net income	357,698				357,688	10
Ending balance (in shares) at Sep. 30, 2017		57,875,848
Ending balance at Sep. 30, 2017	711,899	$ 58	1,077,217	936	(367,197)	885
Increase (Decrease) in Stockholders' Equity
Net income	72,391
Ending balance (in shares) at Sep. 30, 2017		57,875,848
Ending balance at Sep. 30, 2017	$ 711,899	$ 58	$ 1,077,217	$ 936	$ (367,197)	$ 885