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Commitments, Contingencies And Legal Matters (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Unconditional purchase obligations, 2018 $ 756,800
Unconditional purchase obligations, 2019 527,100
Unconditional purchase obligations, 2020 353,700
Unconditional purchase obligations, 2021 168,300
Unconditional purchase obligations, 2022 156,300
Unconditional purchase obligations, Total $ 1,962,200