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Credit Losses - Accounts Receivable (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Noncurrent, Past Due [Line Items]      
Percentage of receivables, current 90.00% 59.00%  
Accounts receivable, net $ 171,500 $ 173,700  
Allowance for doubtful accounts, current $ 3,374 $ 7,056 $ 41
Past due less than 60 days      
Accounts Receivable, Noncurrent, Past Due [Line Items]      
Percentage of receivables, past due 2.00% 24.00%  
Past due less than 120 days      
Accounts Receivable, Noncurrent, Past Due [Line Items]      
Percentage of receivables, past due 3.00% 37.00%