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Fair Value Measurements - Summary of Assets and Liabilities Carried at Book Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
May 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Book value $ 397,974 $ 380,569  
Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Book value [1] 245,471 245,088  
Manquiri Note Receivable [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Nontrade Receivables [1] 40,315    
Revolving Credit Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Book value [1] 115,000 100,000  
Portion at Other than Fair Value Measurement | Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 238,019 243,913  
Portion at Other than Fair Value Measurement | Senior Notes due 2024 | Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 0 0  
Portion at Other than Fair Value Measurement | Senior Notes due 2024 | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 238,019 243,913  
Portion at Other than Fair Value Measurement | Senior Notes due 2024 | Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 0 0  
Portion at Other than Fair Value Measurement | Manquiri Note Receivable [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables, Fair Value Disclosure 40,157    
Portion at Other than Fair Value Measurement | Manquiri Note Receivable [Member] | Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables, Fair Value Disclosure 0    
Portion at Other than Fair Value Measurement | Manquiri Note Receivable [Member] | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables, Fair Value Disclosure 0    
Portion at Other than Fair Value Measurement | Manquiri Note Receivable [Member] | Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables, Fair Value Disclosure 40,157    
Portion at Other than Fair Value Measurement | Revolving Credit Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 115,000 100,000  
Portion at Other than Fair Value Measurement | Revolving Credit Facility | Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 0 0  
Portion at Other than Fair Value Measurement | Revolving Credit Facility | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 115,000 100,000  
Portion at Other than Fair Value Measurement | Revolving Credit Facility | Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 0 0  
Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate     5.875%
Net unamortized debt issuance costs $ 4,500 $ 4,900  
Senior Notes due 2024 | Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate   5.875%  
Revolving Credit Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate 4.335%    
Net unamortized debt issuance costs $ 1,700 $ 1,900  
[1] Net of unamortized debt issuance costs of $4.5 million and $4.9 million at June 30, 2018 and December 31, 2017, respectively.