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Fair value measurements (Details 4) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Fair value, balance sheet grouping [Line Items]
Long-term debt	$ 2,747,763	$ 2,741,900	$ 2,253,274
Carrying amount
Fair value, balance sheet grouping [Line Items]
Long-term debt	2,747,763	2,741,900	2,253,274
Fair value
Fair value, balance sheet grouping [Line Items]
Long-term debt, fair value	$ 2,755,041	$ 2,984,866	$ 2,473,806

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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