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Commitments and Contingent Liabilities - Unrecorded Unconditional Purchase Obligation (Details) - Purchase Commitment
$ in Thousands
Sep. 30, 2019
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
Less than 1 year $ 252,535
1 - 3 years 489,023
3 - 5 years 412,960
More than 5 years 1,113,008
Total Purchase Obligations $ 2,267,526