CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Accumulated Deficit	Accumulated Distributions	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2015		325,183
Balance at Dec. 31, 2015	$ 794,917	$ 3,252	$ 2,863,833	$ (364,236)	$ (1,699,076)	$ (8,856)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	65,948			65,948
Distributions, declared and paid ($0.6500 per share)	(211,369)				(211,369)
Foreign currency translation adjustment	631					631
Current period adjustment to recognize changes in fair value of cash flow hedges	$ 202					202
Balance (in shares) at Dec. 31, 2016	325,183	325,183
Balance at Dec. 31, 2016	$ 650,329	$ 3,252	2,863,833	(298,288)	(1,910,445)	(8,023)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(1,616)			(1,616)
Foreign currency translation adjustment	298					298
Current period adjustment to recognize changes in fair value of cash flow hedges	37					37
Balance (in shares) at Mar. 31, 2017		325,183
Balance at Mar. 31, 2017	$ 649,048	$ 3,252	$ 2,863,833	$ (299,904)	$ (1,910,445)	$ (7,688)