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Equity Incentive Plan - Valuation assumption (Details) - Performance units and shares [Member]
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (years) 2 years 10 months 24 days 2 years 10 months 24 days 2 years 10 months 24 days
Volatility 23.60% 33.50% 33.90%
Risk-free rate 4.40% 1.80% 0.20%