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Long-Term Debt (Debt Maturities) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2018 $ 1,188,514
2019 762,614
2020 1,292,478
2021 640,734
2022 1,380,583
Thereafter 2,274,528
Long Term Debt and Capital lease obligations $ 7,539,451