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Share-based Compensation Leveraged Restricted Share Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 320 days    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 5,133,000    
Leveraged Restricted Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Nonvested, shares 10 41  
Nonvested, Weighted Average Grant Date Fair Value $ 106.90 $ 92.66  
Granted, Weighted Average Grant Date Fair Value     $ 106.90
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (3)    
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited, Weighted Average Grant Date Fair Value $ 106.90    
Vested, shares (28) 0  
Vested, Weighted Average Grant Date Fair Value $ 68.85    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 210,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1,028,000 $ 619,000  
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%