Long-term debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total principal long-term debt	$ 3,090,000	$ 3,256,000
Debt issuance costs	(28,072)	(31,378)
Unamortized premiums	6,518	7,348
Total long-term debt	3,068,446	3,231,970
Borrowings under revolving credit agreement expiring August 2024
Debt Instrument [Line Items]
Total principal long-term debt	$ 0	166,000
Unsecured notes bearing fixed rate interest at 4.75% due March 2026 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.0475%
Total principal long-term debt	$ 550,000	550,000
Unsecured notes bearing fixed rate interest at 7.75% due June 2027 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.0775%
Total principal long-term debt	$ 200,000	200,000
Unsecured notes bearing fixed rate interest at 7.25% due September 2027 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.0725%
Total principal long-term debt	$ 240,000	240,000
Unsecured notes bearing fixed rate interest at 4.625% due March 2028 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.04625%
Total principal long-term debt	$ 1,000,000	1,000,000
Unsecured notes bearing fixed rate interest at 5.00% due September 2029 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.05%
Total principal long-term debt	$ 1,100,000	$ 1,100,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt premium.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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