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Debt (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt |  |  |
Basis Spread of Variable Rate, LIBOR, Minimum | 50.00% |  |
Amount of interest costs incurred, capitalized, and expensed |  |  |
Interest costs incurred | $ 1,424,000 | $ 2,796,000 | $ 2,172,000
Less: Interest capitalized | (574,000) | (512,000) | (144,000)
Interest expense | $ 850,000 | $ 2,284,000 | $ 2,028,000
LIBOR | Minimum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 65.00% |  |
LIBOR | Maximum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 150.00% |  |
Base rate | Minimum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 0.00% |  |
Base rate | Maximum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 50.00% |  |
Primary Revolving Credit Facility |  |  |
Debt |  |  |
Long-term Debt | $ 900,000 |  |
Line of Credit Facility, Fair Value of Amount Outstanding | 304,400,000 |  |
Primary Revolving Credit Facility | Wells Fargo Bank |  |  |
Debt |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 300,000,000 |  |
Primary Revolving Credit Facility | Minimum | Wells Fargo Bank |  |  |
Debt |  |  |
Facility fees on the available commitment of the facility (as a percent) | 10.00% |  |
Primary Revolving Credit Facility | Maximum | Wells Fargo Bank |  |  |
Debt |  |  |
Facility fees on the available commitment of the facility (as a percent) | 25.00% |  |

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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