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Senior Notes Carrying value of the Senior Notes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Accumulated Amortization, Debt Issuance Costs	$ 1,242,000		$ 1,242,000		$ 819,000
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount	400,000,000		400,000,000
Debt discount, net of accumulated amortization of $1,293 and $181, respectively	(4,319,000)		(4,319,000)		(3,582,000)
Debt issuance costs, net of accumulated amortization of $496 and $51, respectively	(1,225,000)		(1,225,000)		(1,917,000)
Carrying value of the Senior Notes	394,456,000		394,456,000		395,968,000
Accumulated amortization, debt discount	181,000		181,000		1,293,000
Accumulated Amortization, Debt Issuance Costs	51,000		51,000		496,000
Senior Notes [Member] | Senior Note Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Premium	0		0		$ 1,467,000
Accretion of debt discount, net of debt premium on senior notes	$ 0	$ 56,000	$ 85,000	$ 165,000

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