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Claim Settlement Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 24, 2016
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Receivables with Imputed Interest [Line Items]              
Litigation settlement receivable   $ 12,651 $ 12,651   $ 12,651   $ 0
Litigation settlement proceeds   0   $ 0 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   $ 100 $ 100        
Other income | BP Exploration & Production Inc.              
Receivables with Imputed Interest [Line Items]              
Litigation settlement proceeds         $ 12,500