Senior Notes Carrying value of the Senior Notes (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Accumulated Amortization, Debt Issuance Costs	$ 700,000	$ 337,000
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount	400,000,000	400,000,000
Debt discount, net of accumulated amortization of $765 and $1,158, respectively	(3,717,000)	(4,110,000)
Debt issuance costs, net of accumulated amortization of $216 and $424, respectively	(1,990,000)	(2,131,000)
Carrying value of the Senior Notes	395,816,000	395,447,000
Accumulated amortization, debt discount	1,158,000	765,000
Accumulated Amortization, Debt Issuance Costs	424,000	216,000
Senior Notes [Member] \| Senior Note Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Premium	$ 1,523,000	$ 1,688,000

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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