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Debt - Schedule of Future Principal Repayments (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Debt Disclosure [Abstract]  
2015 $ 228
2016 91
2017 86
2018 22
2019 54,429
2021 and thereafter 900,000
Future principal repayments of long term debt including capital lease obligations $ 954,856