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Non-operating (loss) income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Non-operating (loss) income, net [Abstract]        
Interest Income $ 6,457 $ 5,823 $ 21,045 $ 19,894
income from transition services 3,750 0 11,850 0
Gain (Loss) on Extinguishment of Debt 0 0 0 (6,554)
Other Nonoperating Income (Expense) 291 112 1,242 1,059
Nonoperating (loss) Income $ 10,498 $ 5,935 $ 34,137 $ 14,399