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Fair Value Measurements - Summary of Assets and Liabilities Carried at Book Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value $ 432,269 $ 433,889
Senior Notes due 2024    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value [1] 246,045 245,854
Manquiri Note Receivable [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Nontrade Receivables [1] 1,982 5,487
Revolving Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value [2] 135,000 135,000
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 237,895 220,446
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 237,895 220,446
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 1,982 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 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 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 1,982 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 135,000 135,000
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 135,000 135,000
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 $ 4,000 4,100
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 4.986%  
Net unamortized debt issuance costs $ 2,200 $ 2,200
[1] Net of unamortized debt issuance costs of $4.0 million and $4.1 million at March 31, 2019 and December 31, 2018, respectively.
[2] Unamortized debt issuance costs of $2.2 million and $2.2 million at March 31, 2019 and December 31, 2018, respectively, included in Other Non-Current Assets.