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Selected Balance Sheet Information: Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Selected Balance Sheet Information [Abstract]
Billed Accounts Receivable	$ 257,982	$ 181,027
Unbilled Revenue	130,294	142,738
Less: Allowance for Credit Losses	(4,486)	(2,113)	$ (8,251)	$ (7,003)
Accounts receivable, net	$ 383,790	$ 321,652

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Selected Balance Sheet Information [Abstract]

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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