REVENUE RECOGNITION, Revenue Recognition Adoption Impact (Details) - USD ($) $ in Thousands |
1 Months Ended | 3 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended | |||||||||||||||||||||||||||||||||
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Oct. 31, 2020 |
[1] | Sep. 30, 2020 |
[2] | Jun. 30, 2020 |
[3] | Mar. 31, 2020 |
[4] | Dec. 31, 2019 |
[5] | Sep. 30, 2019 |
[6] | Jun. 30, 2019 |
[7] | Mar. 31, 2019 |
[8] | Mar. 31, 2020 |
Oct. 31, 2019 |
Dec. 31, 2020 |
[1] | Mar. 31, 2019 |
Mar. 31, 2018 |
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Revenue Recognition [Abstract] | ||||||||||||||||||||||||||||||||||||||
Operating revenue from non-affiliates | $ 444,402 | $ 692,305 | $ 1,259,529 | $ 1,317,295 | ||||||||||||||||||||||||||||||||||
Operating revenue from affiliates | 23,323 | 30,614 | 48,378 | 56,142 | ||||||||||||||||||||||||||||||||||
Reimbursable revenue from non-affiliates | 18,038 | 34,304 | 61,755 | 60,538 | ||||||||||||||||||||||||||||||||||
Revenue | $ 105,827 | $ 318,220 | $ 333,176 | $ 284,839 | $ 329,858 | $ 349,343 | $ 366,668 | $ 323,793 | 485,763 | 757,223 | $ 200,924 | 1,369,662 | $ 1,433,975 | |||||||||||||||||||||||||
Revenue from Contract with Customer Benchmark | ||||||||||||||||||||||||||||||||||||||
Revenue Recognition [Abstract] | ||||||||||||||||||||||||||||||||||||||
Operating revenue from non-affiliates | 443,716 | 691,360 | 1,239,117 | |||||||||||||||||||||||||||||||||||
Operating revenue from affiliates | 8,413 | 12,015 | 23,099 | |||||||||||||||||||||||||||||||||||
Reimbursable revenue from non-affiliates | 18,038 | 34,304 | 61,755 | |||||||||||||||||||||||||||||||||||
Revenue | 470,167 | 737,679 | 1,323,971 | |||||||||||||||||||||||||||||||||||
Revenue Not from Contract with Customer | ||||||||||||||||||||||||||||||||||||||
Revenue Recognition [Abstract] | ||||||||||||||||||||||||||||||||||||||
Operating revenue from non-affiliates | 686 | 945 | 20,412 | |||||||||||||||||||||||||||||||||||
Operating revenue from affiliates | $ 14,910 | $ 18,599 | $ 25,279 | |||||||||||||||||||||||||||||||||||
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