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Non-operating (loss) income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Non-operating (loss) income, net [Abstract]        
Interest Income $ 7,228 $ 6,583 $ 14,588 $ 14,071
income from transition services 4,050 0 8,100 0
Gain (Loss) on Extinguishment of Debt 0 (6,554) 0 (6,554)
Other Nonoperating Income (Expense) 158 631 951 947
Nonoperating (loss) Income $ 11,436 $ 660 $ 23,639 $ 8,464