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Debt (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Long-term Debt, by Maturity  
2014 (remainder) $ 234,186
2015 209,010
2016 590,778
2017 800,696
2018 525,381
Thereafter through 2038 (d) 1,435,829
Long Term Debt Before Unamortized Discount 3,795,880
Unamortized premium, net 2,490
Total scheduled debt principal payments $ 3,798,370