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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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