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1. Significant Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]        
Accounts Receivable, Allowance for Credit Loss $ 15,029 $ 15,142 $ 19,800 $ 20,200
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 1,700 1,400 1,200  
Accounts Receivable, Allowance for Credit Loss, Writeoff (1,900) (6,400) (1,600)  
Accounts Receivable, Allowance for Credit Loss, Recovery 100 300 $ 0  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 0 0    
Goodwill, Impairment Loss $ 0 $ 0    
Revenue Allocation Percent To Lease Elements 3.00% 2.00% 3.00%