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Equity-Based Compensation (Details) - LTIP - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
6 Months Ended
Mar. 02, 2015
Jun. 30, 2015
May. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pool of shares of common stock for issuance in connection with share-based awards before additional approval     3,400
Pool of shares of common stock for issuance in connection with share-based awards     5,500
Number of shares available for grant   1,800  
Award vesting period   3 years  
Vesting Period Change in Control Termination Without Cause   2 years  
Restricted Stock and Restricted Stock Units      
Restricted Stock and Restricted Stock Units      
Share Based Compensation Arrangements By Share Based Payment Award Options Expiration Term After Retirement Or Termination Without Cause   1 year  
Restricted stock and performance based share unit award activity      
Non-vested shares at the beginning of the period, number (in shares)   407  
Granted, number (in shares)   460  
Forfeited, number (in shares)   (37)  
Vested, number (in shares)   (107)  
Non-vested shares at the end of the period, number (in shares)   723  
Weighted Average Grant-Date Fair Value (per share)      
Non-vested shares at the beginning of the period (in dollars per share)   $ 18.14  
Granted (in dollars per share)   8.05  
Forfeited (in dollars per share)   15.49  
Vested (in dollars per share)   16.98  
Non-vested shares at the end of the period (in dollars per share)   $ 12.04  
Unrecognized compensation cost   $ 4.6  
Weighted-average period over which unrecognized compensation cost recognized prior to vesting   2 years 4 months 24 days  
Performance Based Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   3 years  
Restricted stock and performance based share unit award activity      
Non-vested shares at the beginning of the period, number (in shares)   497  
Granted, number (in shares)   601  
Forfeited, number (in shares)   (73)  
Vested, number (in shares)   (97)  
Non-vested shares at the end of the period, number (in shares)   928  
Weighted Average Grant-Date Fair Value (per share)      
Non-vested shares at the beginning of the period (in dollars per share)   $ 21.84  
Granted (in dollars per share)   9.66  
Forfeited (in dollars per share)   19.86  
Vested (in dollars per share)   17.61  
Non-vested shares at the end of the period (in dollars per share)   $ 14.55  
Assumptions:      
Risk-free interest rate (as a percent) 1.00%    
Expected volatility (as a percent) 37.70%    
Expected option life 2 years 9 months 18 days    
Fair value (in dollars per share) $ 9.66    
Performance Based Share Units | Maximum      
Performance-Based Share Units      
Percentage of target amount, high end of range   200.00%  
Performance Based Share Units | Minimum      
Performance-Based Share Units      
Percentage of target amount, low end of range   0.00%