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, 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   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   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   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   $ 283