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Debt and Credit Facilities (Schedule of Maturities of Long-term Debt) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2018 $ 0
2019 0
2020 250,000
2021 0
2022 0
After 2022 750,000
Unamortized discount and debt issuance expenses (10,377)
Total $ 989,623