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Long-term debt outstanding (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Long-term debt outstanding [Line Items]      
Long-term debt $ 2,455,235 $ 2,243,107 $ 2,198,027
Long-term debt due within one year 16,560 16,540 251,846
Long-term debt $ 2,438,675 2,226,567 1,946,181
Senior Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 4.45%    
Long-term debt $ 1,850,000 1,850,000 1,381,000
Commercial Paper      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 1.88%    
Long-term debt $ 265,000 222,900 473,900
Term Loan Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 2.00%    
Long-term debt $ 9,100 9,100 209,800
Credit Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 3.00%    
Long-term debt $ 259,550 89,050 62,875
Medium-term Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 6.68%    
Long-term debt $ 50,000 50,000 50,000
Other Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 4.59%    
Long-term debt $ 28,374 29,117 26,251
Long-term Debt      
Long-term debt outstanding [Line Items]      
Unamortized Debt Issuance Costs 6,640 7,010 5,410
Discount $ 149 $ 50 $ 389