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Senior Notes (Carrying Value of Senior Notes) (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Accumulated amortization, debt issuance costs $ 2,616,000 $ 2,478,000
Senior Notes    
Debt Instrument [Line Items]    
Principal amount 400,000,000 400,000,000
Debt discount, net of accumulated amortization of $1,309 and $1,441, respectively (3,059,000) (3,191,000)
Debt issuance costs, net of accumulated amortization of $373 and $411, respectively (866,000) (904,000)
Carrying value of the Senior Notes 396,075,000 395,905,000
Accumulated amortization, debt discount 1,441,000 1,309,000
Accumulated amortization, debt issuance costs $ 411,000 $ 373,000