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Fair Value Measurements - Summary of Carrying Value and Estimated Fair Value of Liabilities (Details) - USD ($)
$ in Thousands
Oct. 07, 2018
Dec. 31, 2017
Carrying value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Capital lease obligations $ 10,385 $ 10,938
Estimated Fair Value | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Capital lease obligations $ 10,633 $ 11,563