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Unrecorded Unconditional Purchase Obligation (Details) - Purchase Commitment [Member]
$ in Thousands
Jun. 30, 2018
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
Less than 1 year $ 207,148
1 - 3 years 419,091
3 - 5 years 306,479
More than 5 years 620,806
Total Purchase Obligations $ 1,553,524