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Fair Value Measurements - Summary of Assets and Liabilities Carried at Book Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value $ 276,781 $ 433,889
Senior Notes due 2024    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value [1] 226,709 245,854
Manquiri Note Receivable [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Nontrade Receivables [1]   5,487
Revolving Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value [2] 0 135,000
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 226,843 220,446
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 226,843 220,446
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   5,487
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   5,487
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 0 135,000
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 0 135,000
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]    
Net unamortized debt issuance costs $ 3,300 4,100
Revolving Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 5.60%  
Net unamortized debt issuance costs $ 2,500 $ 2,200
[1] Net of unamortized debt issuance costs of $3.3 million and $4.1 million at September 30, 2019 and December 31, 2018, respectively.
[2] Unamortized debt issuance costs of $2.5 million and $2.2 million at September 30, 2019 and December 31, 2018, respectively, included in Other Non-Current Assets.