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Senior Notes Carrying value of the Senior Notes (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 19, 2019	May 31, 2018
Debt Instrument [Line Items]
Accumulated Amortization, Debt Premium	$ 0	$ 221,000
Debt issuance costs, net of accumulated amortization of $44	(1,136,000)	(1,618,000)
Accumulated Amortization, Debt Issuance Costs	819,000	337,000
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount	400,000,000
Debt premium, net of accumulated amortization of $0 and $221, respectively	1,467,000
Accumulated Amortization, Debt Discount	1,020,000	492,000
Debt discount, net of accumulated amortization of $154	(3,582,000)	(4,110,000)
Debt issuance costs, net of accumulated amortization of $44	(1,917,000)	(2,131,000)
Carrying value of the Senior Notes	395,968,000	395,447,000
Accumulated Amortization, Debt Issuance Costs	496,000	216,000
Senior Notes [Member] | Senior Note Two [Member]
Debt Instrument [Line Items]
Principal amount	400,000,000	400,000,000	$ 75,000,000.0	$ 325,000,000.0
Debt premium, net of accumulated amortization of $0 and $221, respectively	$ 1,467,000	$ 1,688,000	$ 1,700,000

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