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Stock-Based Compensation Summary of Stock Option Activity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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    
Granted 310,000 280,000 88,268
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 4 months 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years 2 months 16 days    
Ajusted EBITDA Threshhold $ 46.0    
Share-based Compensation awards, performanced-based [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 0.00 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 0.00 0.00  
Granted 185,000 [1] 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 8.00 [1] 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 185,000 [1] 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 0  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 0.00 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period   0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price   0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 9 years 6 months    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 0 years    
Share-based Compensation awards, time-based [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,893,731 1,955,792  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 4.15 3.29  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 1,607,307 1,780,663  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 3.41 3.00  
Granted 125,000 280,000  
Share-based Compensation Arrangement, Options, Vested, Number 85,233 148,705  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Exercise Price $ 8.50 5.78  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 7.97 7.84  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2,016,231 1,893,731  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (2,500) (322,061)  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 7.84 1.88  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period 0 (20,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price   7.84  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years 2 months 15 days    
[1] (1) The performance-based stock options granted during the year ended December 31, 2012 will begin to vest equally over three years upon the Company's compensation committee determining that the Company has attained an Adjusted EBITDA of $46.0 million.