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Combined Guarantor Subsidiaries - Revenues - Remaining Performance Obligations (Details)
Dec. 31, 2019
USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Remaining performance obligation $ 117,826,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 5 years
Remaining performance obligation $ 25,651,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 15 years
Remaining performance obligation $ 47,224,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2040-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 20 years
Remaining performance obligation $ 44,951,000
Guarantor Subsidiaries  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Remaining performance obligation $ 68,191,000
Guarantor Subsidiaries | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 5 years
Remaining performance obligation $ 12,895,000
Guarantor Subsidiaries | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 15 years
Remaining performance obligation $ 23,584,000
Guarantor Subsidiaries | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2040-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 20 years
Remaining performance obligation $ 31,712,000