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Equity-Based Compensation (Details 3) (USD $)
3 Months Ended
Mar. 31, 2013
$9.78 - 11.11 [Member]
 
Summarizes information about stock options  
Range of Exercise Prices, Lower Range Limit $ 9.78
Range of Exercise Prices, Upper Range Limit $ 11.11
Number Outstanding and Exercisable 244,050
Weighted-Average Remaining Contractual Life (Years) 1 year 1 month 17 days
Weighted Average Exercise Price $ 10.49
$ 13.68 - 16.24 [Member]
 
Summarizes information about stock options  
Range of Exercise Prices, Lower Range Limit $ 13.68
Range of Exercise Prices, Upper Range Limit $ 16.24
Number Outstanding and Exercisable 86,300
Weighted-Average Remaining Contractual Life (Years) 2 years 6 months
Weighted Average Exercise Price $ 13.97