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Debt - Schedule of Future Principal Repayments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
2015 $ 356
2016 101
2017 68,164
2018 0
2019 0
2024 and thereafter 900,000
Future principal repayments of long term debt including capital lease obligations $ 968,621