Condensed Consolidated Statements of Shareholders' Deficit (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Distributions in Excess of Accumulated Earnings
Beginning balance, value at Dec. 31, 2015	$ (1,166,906)	$ 15	$ 1,392	$ (5,427)	$ (1,162,886)
Beginning balance, shares at Dec. 31, 2015		149,862,459
Net (loss) income	8,036				8,036
Issuance of common stock	1,085		1,085
Other comprehensive gain (loss)	(40,362)			(40,362)
Common stock dividends	(90,428)				(90,428)
Net share settlement	(1,266)				(1,266)
Stock-based compensation	930		930
Stock-based compensation, shares		171,785
Ending balance, value at Mar. 31, 2016	(1,288,911)	$ 15	3,407	(45,789)	(1,246,544)
Ending balance, shares at Mar. 31, 2016		150,034,244
Beginning balance, value at Dec. 31, 2016	(1,402,445)	$ 15	141,092	(6,369)	(1,537,183)
Beginning balance, shares at Dec. 31, 2016		155,138,637
Net (loss) income	(20,000)				(20,000)
Amortization of discount on convertible preferred stock	(745)		(745)
Other comprehensive gain (loss)	9,441			9,441
Common stock dividends	(93,692)				(93,692)
Convertible preferred stock dividends	(656)				(656)
Equity issuance cost	(54)		(54)
Net share settlement	(1,690)		(421)		(1,269)
Stock-based compensation	1,632	$ 1	1,631
Stock-based compensation, shares		136,866
Ending balance, value at Mar. 31, 2017	$ (1,508,209)	$ 16	$ 141,503	$ 3,072	$ (1,652,800)
Ending balance, shares at Mar. 31, 2017		155,275,503