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Significant Accounting Policies (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year $ 8,423 $ 10,258 $ 12,920
Additions charged to expense 1,308 1,824 1,051
Other (969) (3,659) (3,713)
Balance at end of year $ 8,762 $ 8,423 $ 10,258