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Share-Based Compensation and Equity Share-Based Compensation and Equity - Non-Employee Share-based Compensation (Details) (Non-employee Plan [Member], USD $)
1 Months Ended 12 Months Ended
Dec. 31, 2006
Dec. 31, 2011
years
Dec. 31, 2005
Non-employee Plan [Member]
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 6,652    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 46  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     34,789
Investment Warrants, Exercise Price   $ 46  
Share-based Compensation, Warrants Issued Grant Date Fair Value   $ 14.66  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   4.45%  
Expected dividend yield   1.63%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   30.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   6