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Equity and Share-Based Compensation (Details 3) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2015
May. 27, 2014
Apr. 20, 2012
Restricted stock awards      
Shares      
Non-vested shares outstanding at the beginning of the period 306,201    
Granted (in shares) 268,677    
Vested (in shares) (136,479)    
Forfeited (in shares) (60,843)    
Non-vested shares outstanding at the end of the period 377,556    
Weighted Average Grant Date Fair Value      
Non-vested shares outstanding at the beginning of the period (in dollars per share) $ 52.76    
Granted (in dollars per share) 12.29    
Vested (in dollars per share) 57.23    
Forfeited (in dollars per share) 47.06    
Non-vested shares outstanding at the end of the period (in dollars per share) $ 22.76    
Additional information      
Unrecognized expense, adjusted for estimated forfeitures (in dollars) $ 6.4    
Weighted-average period for over which unrecognized expense will be recognized 1 year 9 months 18 days    
2012 LTIP      
Restricted Stock Awards      
Number of shares available for future issuance   863,843 656,343
Number of shares authorized 863,843    
Additional information      
Shares available for issuance 170,271    
2012 LTIP | Restricted stock awards      
Restricted Stock Awards      
Number of restricted common stock issued to directors, management and employees under the long term incentive plan (in shares) 377,556    
Vesting period 3 years    
Percentage of awards vesting on each anniversary of the grant 33.33%    
2012 LTIP | Restricted stock awards | Directors      
Restricted Stock Awards      
Vesting period 1 year