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Share-based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 2,511 $ 1,676 $ 5,075 $ 4,181
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 13,146   13,146  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years 5 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     82,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     280,000  
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     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     80,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period     1,000  
Performance Based Stock Awards [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     19,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Leveraged Restricted Stock Awards [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     22,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
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     3,000  
Shares Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Total Fair Value     $ 188