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Fair Value Measurements - Summary of Assets and Liabilities Carried at Book Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
May 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Book value $ 406,494 $ 380,569  
Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Book value [1] 245,662 245,088  
Manquiri Note Receivable [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Nontrade Receivables [1] 9,207    
Revolving Credit Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Book value [2] 120,000 100,000  
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 235,725 243,913  
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 235,725 243,913  
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 9,207    
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 9,207    
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 120,000 100,000  
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 120,000 100,000  
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 $ 4,300 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 4.415%    
Net unamortized debt issuance costs $ 1,500 $ 1,900  
[1] Net of unamortized debt issuance costs of $4.3 million and $4.9 million at September 30, 2018 and December 31, 2017, respectively.
[2] Unamortized debt issuance costs of $1.5 million and $1.9 million at September 30, 2018 and December 31, 2017, respectively, included in Other Non-Current Assets.