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Consolidated 50% Owned Subsidiary - Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income | $ 37,043 | $ 49,475 | $ 43,989 | $ 29,363 | $ 20,058 | $ 32,010 | $ 32,514 | $ 22,429 | $ 20,181 | $ 27,887 | $ 32,534 | $ 12,013 | $ 159,870 | $ 107,011 | $ 92,615

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