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Equity-Based Compensation (Details 3) (USD $)
6 Months Ended
Jun. 30, 2013
$11.04 - 11.11 [Member]
 
Summary of information about stock options  
Range of Exercise Prices, Lower Range Limit $ 11.04
Range of Exercise Prices, Upper Range Limit $ 11.11
Number Outstanding and Exercisable 85,900
Weighted-Average Remaining Contractual Life (Years) 1 year 6 months 29 days
Weighted Average Exercise Price $ 11.08
$13.68 - 14.70 [Member]
 
Summary of information about stock options  
Range of Exercise Prices, Lower Range Limit $ 13.68
Range of Exercise Prices, Upper Range Limit $ 14.70
Number Outstanding and Exercisable 95,300
Weighted-Average Remaining Contractual Life (Years) 2 years 3 months 26 days
Weighted Average Exercise Price $ 13.95