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Subsequent Event (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 28, 2021
Mar. 31, 2021
Mar. 31, 2020
Subsequent Event [Line Items]      
Operating revenue   $ 362,202 $ 305,557
Subsequent Event | J&P Hall Express Delivery      
Subsequent Event [Line Items]      
Considered transferred $ 7,400