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Commitments and Contingencies (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 25, 2020
USD ($)
Feb. 18, 2020
USD ($)
Feb. 07, 2013
plaintiff
Jun. 30, 2021
USD ($)
Dec. 31, 1994
USD ($)
Dec. 31, 2020
USD ($)
Loss Contingencies [Line Items]            
Outstanding surety bond       $ 10,900   $ 10,100
Collective-bargaining arrangement, percentage of participants       36.00%    
Collective-bargaining arrangement, percentage of participants expiring in 2020       2.00%    
Kansas Breach of Settlement Agreement            
Loss Contingencies [Line Items]            
Litigation settlement         $ 58,700  
Number of plaintiffs appealing dismissal | plaintiff     1      
Preferred Freezer Services, LLC Litigation            
Loss Contingencies [Line Items]            
Litigation settlement from other party   $ 550        
Damages sought $ 400,000          
Revolving Credit Facility | Line of Credit            
Loss Contingencies [Line Items]            
Letter of credit amount outstanding       $ 21,900   $ 21,700