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Long-term debt outstanding (Details 1) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Long-term debt outstanding [Line Items]
Long-term debt	$ 2,337,049	$ 2,213,130	$ 2,281,876
Long-term debt due within one year	1,549	1,555	16,560
Long-term debt	$ 2,335,500	2,211,575	2,265,316
Senior Notes
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	4.40%
Long-term debt	$ 1,950,000	1,950,000	1,900,000
Commercial Paper
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	0.32%
Long-term debt	$ 297,400	125,600	290,100
Credit Agreements
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	3.25%
Long-term debt	$ 48,550	95,900	11,200
Medium-term Notes
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	7.32%
Long-term debt	$ 35,000	35,000	50,000
Term Loan Agreements
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	2.00%
Long-term debt	$ 8,400	8,400	9,100
Other Notes
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	0.83%
Long-term debt	$ 3,232	4,034	28,342
Long-term Debt
Long-term debt outstanding [Line Items]
Unamortized Debt Issuance Costs	5,505	5,803	6,668
Discount	$ 28	$ 1	$ 198

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