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Share-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ 5,537 $ 5,752
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 8,597  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 4 months  
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 465,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 1,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 34,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 10,000  
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 249,000  
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 71,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 16,000  
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 48,000  
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  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 5,000  
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 14,000  
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 10,000  
Shares Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Total Fair Value $ 171