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Stockholders' Equity (Details)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Cumulative Convertible Preferred Stock    
Shares issued and outstanding 108 108
Conversion factor   5.00
Common shares resulting if converted 488 488
Series A [Member]
    
Cumulative Convertible Preferred Stock    
Shares issued and outstanding 20 20
Conversion factor 2.50 2.50
Common shares resulting if converted 50 50
Series M [Member]
    
Cumulative Convertible Preferred Stock    
Shares issued and outstanding 88 88
Conversion factor 5.00 5.00
Common shares resulting if converted 438 438