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Commitments and Contingencies (Schedule of Unconditional Purchase Obligations) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies  
2019 $ 349,125
2020 113,636
2021 103,916
2022 95,899
2023 25,281
Thereafter 53,786
Unrecorded Unconditional Purchase Obligation, Total $ 741,643