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Combined Guarantor Subsidiaries - Revenues - Remaining Performance Obligations (Details)
Jun. 30, 2020
USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Remaining performance obligation $ 125,046,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-07-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 5 years
Remaining performance obligation $ 25,080,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-07-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 15 years
Remaining performance obligation $ 52,220,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2040-07-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 20 years
Remaining performance obligation $ 47,746,000
Guarantor Subsidiaries  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Remaining performance obligation $ 71,863,000
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 $ 12,839,000
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 $ 25,383,000
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 $ 33,641,000