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Share-based Compensation Leveraged Restricted Share Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 248 days    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 5,538    
Leveraged Restricted Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Nonvested, shares 41 59  
Nonvested, Weighted Average Grant Date Fair Value $ 92.66 $ 84.85  
Granted, Weighted Average Grant Date Fair Value   $ 106.90 $ 80.34
Vested, shares (18) 0 0
Vested, Weighted Average Grant Date Fair Value $ 67.05    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 281 days    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 1,193    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 619    
Leveraged Restricted Share Awards [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Leveraged Restricted Share Units Earned Out Of Leveraged Restricted Share Units Granted 50.00%    
Leveraged Restricted Share Awards [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Leveraged Restricted Share Units Earned Out Of Leveraged Restricted Share Units Granted 150.00%