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Share-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 1,417 $ 1,730 $ 9,203 $ 7,613
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 8,045   $ 8,045  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 270 days  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     221,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     39,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period     12,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     117,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     37,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period     8,000  
Performance Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     24,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     27,000  
Leveraged Restricted Share Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     11,000  
Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     15,000  
Shares Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Total Fair Value     $ 511