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Non-operating (loss) income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Non-operating (loss) income, net [Abstract]    
Interest Income $ 216 $ 4,421
income from transition services 0 2,100
Other Nonoperating Income (Expense) 228 563
Nonoperating (loss) Income $ 444 $ 7,084