Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION - Schedule of Revenue from third party customers (Details)

v3.20.2
REVENUE RECOGNITION - Schedule of Revenue from third party customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]    
Operating revenue from non-affiliates $ 246,549 $ 304,130
Operating revenue from affiliates 14,959 12,446
Reimbursable revenue from non-affiliates 8,685 16,600
Revenue 270,193 333,176
Revenue    
Disaggregation of Revenue [Line Items]    
Operating revenue from non-affiliates 246,126 303,733
Operating revenue from affiliates 4,594 4,475
Reimbursable revenue from non-affiliates 8,685 16,600
Revenue 259,405 324,808
Revenue not from contract with customer    
Disaggregation of Revenue [Line Items]    
Operating revenue from non-affiliates 423 397
Operating revenue from affiliates $ 10,365 $ 7,971