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Fair Value Measurements - Summary of Assets and Liabilities Carried at Book Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value $ 396,984 $ 380,569
Senior Notes due 2024    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value [1] 245,280 245,088
Manquiri Note Receivable [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Nontrade Receivables [1] 39,887  
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 244,520 243,913
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 244,520 243,913
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 39,887  
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 39,887  
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
[1] Net of unamortized debt issuance costs of $4.7 million and $4.9 million at March 31, 2018 and December 31, 2017, respectively.