Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Carrying Value and Estimated Fair Value of Liabilities (Details)

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Fair Value Measurements - Summary of Carrying Value and Estimated Fair Value of Liabilities (Details) - USD ($)
$ in Thousands
Apr. 22, 2018
Dec. 31, 2017
Carrying value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Capital lease obligations $ 10,754 $ 10,938
Estimated Fair Value | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Capital lease obligations $ 11,055 $ 11,563