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Non-operating (loss) income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Non-operating (loss) income, net [Abstract]        
Gain (Loss) on Extinguishment of Debt $ 6,554 $ 0 $ 6,554 $ 0
Interest Income 6,583 3,309 14,071 5,554
Other Nonoperating Income (Expense) 631 86 947 (858)
Gain (Loss) on Disposition of Business 0 10,607 0 10,607
Nonoperating (loss) Income $ 660 $ 14,002 $ 8,464 $ 15,303