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Share-based Compensation Leveraged Restricted Share Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Nonvested, shares 330 330  
Nonvested, Weighted Average Grant Date Fair Value $ 28.38 $ 24.06  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (30)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 26.51    
Vested, shares (130)    
Vested, Weighted Average Grant Date Fair Value $ 28.52    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 4,800,000 $ 1,200,000 $ 1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 160    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 37.13 $ 19.08 $ 34.15
Leveraged Restricted Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Nonvested, shares 0 10  
Nonvested, Weighted Average Grant Date Fair Value $ 0.00 $ 106.90  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (5)    
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 (5)    
Vested, Weighted Average Grant Date Fair Value $ 106.90    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 200,000 $ 1,000,000 $ 600,000
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%