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Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
ASSETS    
Total assets   $ 296,314
US Treasury Bill Securities    
ASSETS    
Investments in U.S. Treasury bills   266,963
Interest rate derivatives (included in other assets)    
ASSETS    
Interest rate derivatives (included in other assets) $ 33,694 29,351
Level 1    
ASSETS    
Total assets   266,963
Level 1 | US Treasury Bill Securities    
ASSETS    
Investments in U.S. Treasury bills   266,963
Level 1 | Interest rate derivatives (included in other assets)    
ASSETS    
Interest rate derivatives (included in other assets) 0 0
Level 2    
ASSETS    
Total assets   29,351
Level 2 | US Treasury Bill Securities    
ASSETS    
Investments in U.S. Treasury bills   0
Level 2 | Interest rate derivatives (included in other assets)    
ASSETS    
Interest rate derivatives (included in other assets) 33,694 29,351
Level 3    
ASSETS    
Total assets   0
Level 3 | US Treasury Bill Securities    
ASSETS    
Investments in U.S. Treasury bills   0
Level 3 | Interest rate derivatives (included in other assets)    
ASSETS    
Interest rate derivatives (included in other assets) $ 0 $ 0