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Level 4 Stock-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Stock-Based Compensation [Abstract]      
Maximum number of shares approved for issuance under stock-based compensation plan 3,100,000 3,100,000  
Number of shares available for future issuance under stock-based compensation plan 2,800,000 2,800,000  
Number of Options [Abstract]      
Stock options, Outstanding, December 31, 2012   0  
Stock options, Granted   161,257  
Stock options, Outstanding, June 30, 2013 161,257 161,257  
Stock options, Vested and expected to vest, June 30, 2013 132,484 132,484  
Stock options, Exercisable, June 30, 2013 0 0  
Weighted Average Exercise Price Per Option [Abstract]      
Weighted average exercise price, Outstanding at December 31, 2012   $ 0.00  
Weighted average exercise price, Granted   $ 27.19  
Weighted average exercise price, Outstanding at June 30, 2013 $ 27.19 $ 27.19  
Weighted average exercise price, Vested and expected to vest, June 30, 2013 $ 27.19 $ 27.19  
Weighted average exercise price, Exercisable, June 30, 2013 $ 0.00 $ 0.00  
Weighted Average Remaining Contractual Life (years) [Abstract]      
Weighted average remaining life (years), Outstanding, June 30, 2013   9 years 7 months 25 days  
Weighted average remaining life (years), Vested and expected to vest, June 30, 2013   9 years 7 months 25 days  
Aggregate Intrinsic Value (thousands) [Abstract]      
Aggregate intrinsic value (thousands), Outstanding, June 30, 2013 $ 0 $ 0  
Aggregate intrinsic value (thousands), Vested and expected to vest, June 30, 2013 0 0  
Aggregate intrinsic value (thousands), Exercisable, June 30, 2013 0 0  
Assumptions used to calculate the fair value of stock options [Abstract]      
Expected volatility   60.90%  
Expected life (in years)   6 years  
Risk-free interest rate   1.00%  
Expected dividends   0.00%  
Weighted average fair value per option granted   $ 14.87  
Unvested, Number of shares [Abstract]      
Unvested, December 31, 2012, Unvested shares   0  
Granted, Unvested shares   104,285  
Unvested, June 30, 2013, Unvested shares 104,285 104,285  
Weighted Average Grant Date Fair Value [Abstract]      
Unvested, December 31, 2012, Weighted Average Grant Date Fair Value   $ 0.00  
Granted, Weighted Average Grant Date Fair Value   $ 26.65  
Unvested, June 30, 2013, Weighted Average Grant Date Fair Value $ 26.65 $ 26.65  
Compensation Expense [Abstract]      
Stock-based compensation expense 830,000 1,073,000 0
Remaining unrecognized compensation expense 3,600,000 3,600,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   2 years 3 months  
Stock Options [Member]
     
Compensation Expense [Abstract]      
Stock-based compensation expense 195,000 268,000  
Performance Stock Unit [Member]
     
Unvested, Number of shares [Abstract]      
Granted, Unvested shares   90,124  
Restricted Stock Unit [Member]
     
Unvested, Number of shares [Abstract]      
Granted, Unvested shares   14,161  
Performance Stock Unit and Restricted Stock Unit [Member]
     
Compensation Expense [Abstract]      
Stock-based compensation expense $ 635,000 $ 805,000