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Share-based Compensation Performance Units (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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    
Performance units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Nonvested, shares 58 59  
Nonvested, Weighted Average Grant Date Fair Value $ 32.39 $ 59.15  
Granted, shares 58    
Granted, Weighted Average Grant Date Fair Value $ 19.94 $ 28.25 $ 93.34
Vested, shares (46)    
Vested, Weighted Average Grant Date Fair Value $ 41.25    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 300 days    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 530    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1,843 $ 842 $ 2,650
Performance units [Member] | 2012 Performance units [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 Performance Share Units Earned Out Of Performance Share Units Granted 0.00%    
Performance units [Member] | 2012 Performance units [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 Performance Share Units Earned Out Of Performance Share Units Granted 200.00%    
Performance units [Member] | 2013 Performance units [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 Performance Share Units Earned Out Of Performance Share Units Granted 0.00%    
Performance units [Member] | 2013 Performance units [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 Performance Share Units Earned Out Of Performance Share Units Granted 200.00%    
Performance units [Member] | 2014 Performance units [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 Performance Share Units Earned Out Of Performance Share Units Granted 0.00%    
Performance units [Member] | 2014 Performance units [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 Performance Share Units Earned Out Of Performance Share Units Granted 200.00%    
Performance Based Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Forfeitured, Weighted Average Grant Date Fair Value $ 37.72    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (13)    
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)    
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    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1,028 $ 619