Equity - Convertible Preferred Stock Table (Details)							12 Months Ended									12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 5.75% Cumulative Convertible Preferred Stock	Dec. 31, 2012 5.75% Cumulative Convertible Preferred Stock Series A	Dec. 31, 2012 4.50% Cumulative Convertible Preferred Stock [Member]	Dec. 31, 2012 5.0% Cumulative Convertible Preferred Stock Series Two Thousand And Five B [Member]	Dec. 30, 2013 Preferred Stock	Dec. 31, 2013 Preferred Stock	Dec. 30, 2012 Preferred Stock	Dec. 31, 2012 Preferred Stock	Dec. 30, 2011 Preferred Stock	Dec. 31, 2011 Preferred Stock	Dec. 30, 2011 Preferred Stock 5.75% Cumulative Convertible Preferred Stock	Dec. 31, 2011 Preferred Stock 5.75% Cumulative Convertible Preferred Stock	Dec. 31, 2013 Preferred Stock 5.75% Cumulative Convertible Preferred Stock	Dec. 30, 2011 Preferred Stock 5.75% Cumulative Convertible Preferred Stock Series A	Dec. 31, 2013 Preferred Stock 5.75% Cumulative Convertible Preferred Stock Series A	Dec. 31, 2011 Preferred Stock 5.75% Cumulative Convertible Preferred Stock Series A	Dec. 31, 2010 Preferred Stock 5.75% Cumulative Convertible Preferred Stock Series A	Dec. 30, 2011 Preferred Stock 4.50% Cumulative Convertible Preferred Stock [Member]	Dec. 31, 2013 Preferred Stock 4.50% Cumulative Convertible Preferred Stock [Member]	Dec. 31, 2011 Preferred Stock 4.50% Cumulative Convertible Preferred Stock [Member]	Dec. 31, 2010 Preferred Stock 4.50% Cumulative Convertible Preferred Stock [Member]	Dec. 30, 2011 Preferred Stock 5.0% Cumulative Convertible Preferred Stock Series Two Thousand And Five B [Member]	Dec. 31, 2013 Preferred Stock 5.0% Cumulative Convertible Preferred Stock Series Two Thousand And Five B [Member]	Dec. 31, 2011 Preferred Stock 5.0% Cumulative Convertible Preferred Stock Series Two Thousand And Five B [Member]	Dec. 31, 2010 Preferred Stock 5.0% Cumulative Convertible Preferred Stock Series Two Thousand And Five B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding as of January 1	7,251,515	7,251,515	1,497,000	1,100,000	2,559,000	2,096,000								1,500,000	1,497,000		1,100,000	1,100,000	1,100,000		2,559,000	2,559,000	2,559,000		2,096,000	2,096,000	2,096,000
Shares outstanding as of December 31	7,251,515	7,251,515	1,497,000	1,100,000	2,559,000	2,096,000								1,497,000	1,497,000		1,100,000	1,100,000	1,100,000		2,559,000	2,559,000	2,559,000		2,096,000	2,096,000	2,096,000
Stock Issued During Period, Shares, Conversion of Convertible Securities							0	0	0	0	(111,000)	(3,000)	(3,000)	(3,000)		0				0				0