Significant Accounting Policies (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 4,392	$ 8,762	$ 8,423
Additions charged to expense	232	457	1,308
Other	(2,179)	(4,827)	(969)
Balance at end of year	$ 2,445	$ 4,392	$ 8,762