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Revenues - Remaining Performance Obligations (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Remaining performance obligation $ 111,499
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-10-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Remaining performance obligation $ 23,326
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 5 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-10-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Remaining performance obligation $ 45,135
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 15 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2041-10-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Remaining performance obligation $ 43,038
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 20 years