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Equity-Based Compensation (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Additional disclosures  
Equity-based compensation expense, net of forfeitures, attributable to future periods (in dollars) $ 11.9
Restricted stock units
 
Unvested Restricted Stock Units  
Outstanding at beginning of year (in shares) 669,009
Granted (in shares) 247,050
Vested (in shares) (171,182)
Forfeited (in shares) (371,201)
Outstanding at end of year (in shares) 373,676
Outstanding at end of year and expected to vest (in shares) 295,916
Weighted Average Grant Date Fair Value  
Outstanding at beginning of year (in dollars per share) $ 21.16
Granted (in dollars per share) $ 15.64
Vested (in dollars per share) $ 20.59
Forfeited (in dollars per share) $ 21.91
Outstanding at end of year (in dollars per share) $ 17.02
Outstanding at end of year and expected to vest (in dollars per share) $ 16.54
Additional disclosures  
Equity-based compensation expense, net of forfeitures, attributable to future periods (in dollars) 3.7
Weighted average amortization periods 2 years 10 months 24 days
Stock options
 
Additional disclosures  
Equity-based compensation expense, net of forfeitures, attributable to future periods (in dollars) 8.2
Weighted average amortization periods 3 years 1 month 6 days
2007 Equity Incentive Plan
 
Unvested Restricted Stock Units  
Forfeited (in shares) (615,430)
Outstanding at end of year (in shares) 273,676
2007 Equity Incentive Plan | Restricted stock units
 
Equity compensation plans  
Shares issued 247,050
Fair value of awards issued $ 3.9
2007 Equity Incentive Plan | Restricted stock units | Minimum
 
Equity compensation plans  
Award vesting period 3 years
2007 Equity Incentive Plan | Restricted stock units | Maximum
 
Equity compensation plans  
Award vesting period 4 years
2007 Equity Incentive Plan | Stock options | Minimum
 
Equity compensation plans  
Award vesting period 3 years
2007 Equity Incentive Plan | Stock options | Maximum
 
Equity compensation plans  
Award vesting period 4 years