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Combined Guarantor Subsidiaries - Revenues - Remaining Performance Obligations (Details1)
Mar. 31, 2020
USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Remaining performance obligation $ 118,143,000
Guarantor Subsidiaries  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Remaining performance obligation $ 70,213,000