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Long term Debt (Narrative) (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
Financing Arrangements [Abstract]  
Future maturities of long term debt in 2017 $ 569,817,000
Future maturities of long term debt in 2018 13,554,000
Future maturities of long term debt in 2019 14,233,000
Future maturities of long term debt in 2020 14,988,000
Future maturities of long term debt in 2021 15,697,000
Thereafter $ 2,364,278,000
Capital lease duration 25 years