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DEBT - Payments Due on Long-Term Debt, Excluding Capital Lease Obligations (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Debt Disclosure [Abstract]  
2017 $ 70,017
2018 208,328
2019 1,044,598
2020 878,011
2021 161,474
Thereafter 585,767
Long-term debt $ 2,948,195