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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 $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2005
Non-employee Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   34,789
Warrants, Exercise Price $ 46.00  
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 years