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Senior Notes (Carrying Value of Senior Notes) (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Accumulated amortization, debt issuance costs $ 1,508,000 $ 1,324,000
Senior Notes    
Debt Instrument [Line Items]    
Principal amount 400,000,000 400,000,000
Debt discount, net of accumulated amortization of $301 and $544, respectively (3,955,000) (4,199,000)
Debt issuance costs, net of accumulated amortization of $86 and $155, respectively (1,122,000) (1,191,000)
Carrying value of the Senior Notes 394,923,000 394,610,000
Accumulated amortization, debt discount 544,000 301,000
Accumulated amortization, debt issuance costs $ 155,000 $ 86,000