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Selected Balance Sheet Information: Accounts Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Selected Balance Sheet Information [Abstract] |  |  |  |
Billed Accounts Receivable | $ 192,444 | $ 267,571 |  |
Unbilled Revenue | 71,097 | 243,574 |  |
Less: Allowance for Credit Losses | (3,191) | (2,953) | $ (3,193) | $ (2,113)
Account Receivable, net | $ 260,350 | $ 508,192 |  |

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