Long-term debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total principal long-term debt	$ 3,090,000	$ 3,090,000
Debt issuance costs	(24,616)	(26,911)
Unamortized premiums	5,642	6,227
Total long-term debt	$ 3,071,026	3,069,316
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