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Significant Accounting Policies (Schedule of Allowance for Doubtful Accounts) (Details) - Allowance for doubtful accounts - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of year | $ 10,258 | $ 12,920 | $ 14,139
Additions charged to expense | 1,824 | 1,051 | 1,552
Other | (3,659) | (3,713) | (2,771)
Balance at end of year | $ 8,423 | $ 10,258 | $ 12,920

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