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Claim Settlement Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 24, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Receivables with Imputed Interest [Line Items]        
Litigation settlement receivable   $ 12,556   $ 0
Litigation settlement proceeds   $ 12,548 $ 0  
BP Exploration & Production Inc.        
Receivables with Imputed Interest [Line Items]        
Litigation settlement receivable, gross $ 13,200      
Litigation settlement receivable due October 2016 5,000      
Litigation settlement receivable due in October 2017, 2018 and 2019 $ 2,700      
Imputed interest rate on litigation settlement receivable   3.00%    
Litigation settlement receivable   $ 12,500    
Unamortized discount   700    
Interest income (less than)   100    
Other income | BP Exploration & Production Inc.        
Receivables with Imputed Interest [Line Items]        
Litigation settlement proceeds   $ 12,500