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Significant Accounting Policies (Activity in Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Credit Loss [Abstract]      
Balance at beginning of period $ 973 $ 962 $ 945
Provision for doubtful accounts 962 918 343
Deductions [1] 502 907 326
Balance at end of period $ 1,433 $ 973 $ 962
[1] Write-offs, net of recoveries