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Senior Notes Carrying value of the Senior Notes (Details) - USD ($)	Dec. 31, 2021	May 13, 2021	Dec. 31, 2020	May 31, 2018
Debt Instrument [Line Items]
Accumulated Amortization, Debt Premium			$ 221,000
Debt issuance costs, net of accumulated amortization of $44	$ (1,543,000)		(1,136,000)
Accumulated Amortization, Debt Issuance Costs	1,324,000		819,000
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount	400,000,000	$ 400,000,000
Accumulated Amortization, Debt Discount	301,000		1,293,000
Debt discount, net of accumulated amortization of $154	(4,199,000)		(3,582,000)
Debt issuance costs, net of accumulated amortization of $44	(1,191,000)		(1,917,000)
Carrying value of the Senior Notes	394,610,000		395,968,000
Accumulated Amortization, Debt Issuance Costs	86,000		496,000
Senior Notes [Member] | Senior Note Two [Member]
Debt Instrument [Line Items]
Principal amount	400,000,000		400,000,000	$ 400,000,000
Debt premium, net of accumulated amortization of $221	$ 0		$ 1,467,000

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