Stockholders' Equity, Convertible Preferred Stock Table (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding as of January 1, 2013 and 2012 and September 30, 2013 and 2012 (in thousands)	7,251,515	7,251,515	7,251,515	7,251,515
5.75% Cumulative Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding as of January 1, 2013 and 2012 and September 30, 2013 and 2012 (in thousands)	1,497,000	1,497,000	1,497,000	1,497,000
Liquidation preference per share	$ 1,000
5.75% Cumulative Convertible Preferred Stock Series A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding as of January 1, 2013 and 2012 and September 30, 2013 and 2012 (in thousands)	1,100,000	1,100,000	1,100,000	1,100,000
Liquidation preference per share	$ 1,000
4.50% Cumulative Comvertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding as of January 1, 2013 and 2012 and September 30, 2013 and 2012 (in thousands)	2,559,000	2,559,000	2,559,000	2,559,000
Liquidation preference per share	$ 100
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, 2013 and 2012 and September 30, 2013 and 2012 (in thousands)	2,096,000	2,096,000	2,096,000	2,096,000
Liquidation preference per share	$ 100