Debt - 2023 notes (Details) - USD ($)		Sep. 06, 2022	Aug. 24, 2022	Jul. 16, 2021	Jun. 10, 2020	Jun. 30, 2023	Dec. 31, 2022
Debt
Principal amount						$ 1,617,500,000	$ 1,667,500,000
Carrying value	[1]					$ 1,489,607,000	$ 1,385,303,000
2023 Notes
Debt
Principal amount			$ 150,000,000		$ 150,000,000
Interest rate (as a percent)					8.50%
Net proceeds from issuance of unsecured notes					$ 146,400,000
Offering discount					1,500,000
Debt issuance costs					$ 2,100,000
Repurchase of debt				$ 37,500,000
Repurchase of debt, cost				39,500,000
Gain (loss) on extinguishment of debt		$ 700,000		2,500,000
Premium on repurchase of debt				2,000,000
Debt		$ 700,000		$ 500,000
Carrying value			$ 112,500,000
Percentage of debt principal			100.00%

[1] Carrying value represents aggregate principal amount outstanding less unamortized debt issuance costs.