Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Restricted and Unrestricted Shares with Market Conditions (Details)

v2.4.0.6
Stock Based Compensation - Restricted and Unrestricted Shares with Market Conditions (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Feb. 28, 2011
Dec. 31, 2012
Dec. 31, 2011
Relative TSR [Member] | Restricted Share Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted and Unrestricted Share Awards, Grant Date Fair Value $ 1,066    
Unamortized Value Of Restricted and Unrestricted Shares   501 742
Relative TSR [Member] | Unrestricted Share Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted and Unrestricted Share Awards, Grant Date Fair Value 1,066    
Unamortized Value Of Restricted and Unrestricted Shares   338 826
Absolute TSR [Member] | Restricted Share Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted and Unrestricted Share Awards, Grant Date Fair Value 365    
Unamortized Value Of Restricted and Unrestricted Shares   172 254
Absolute TSR [Member] | Unrestricted Share Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted and Unrestricted Share Awards, Grant Date Fair Value 365    
Unamortized Value Of Restricted and Unrestricted Shares   $ 116 $ 283