Quarterly report pursuant to Section 13 or 15(d)

Equity and Share-Based Compensation - Restricted Stock Units (Details)

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Equity and Share-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Oct. 21, 2018
Sep. 30, 2018
Restricted Stock    
Non-vested shares outstanding at the beginning of the period (in shares)   324,984
Granted (in shares)   271,968
Vested (in shares) (67,414) (105,009)
Forfeited (in shares)   (15,167)
Non-vested shares outstanding at the end of the period (in shares)   476,776
Weighted Average Grant Date Fair Value    
Non-vested shares outstanding at the beginning of the period (in dollars per share)   $ 18.84
Granted (in dollars per share)   14.24
Vested (in dollars per share)   19.63
Forfeited (in dollars per share)   15.76
Non-vested shares outstanding at the end of the period (in dollars per share)   $ 16.14
Additional information    
Accelerated vesting due to change reduction in workforce (in shares)   102,092
2016 LTIP    
Share-Based Compensation    
Vesting period   3 years
Additional information    
Unrecognized expense for share-based compensation   $ 2.9
Weighted-average period for over which unrecognized expense will be recognized   10 months 24 days
Awards vesting on the six-month anniversary of the Effective Date | 2016 LTIP    
Share-Based Compensation    
Percentage of awards vesting on each anniversary of the grant   33.33%
Awards vesting on the twelve-month anniversary of the Effective Date | 2016 LTIP    
Share-Based Compensation    
Percentage of awards vesting on each anniversary of the grant   33.33%
Awards vesting on the thirty six-month anniversary of the Effective Date | 2016 LTIP    
Share-Based Compensation    
Percentage of awards vesting on each anniversary of the grant   33.33%