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Revenue Recognition and Contracts with Customers (Schedule of Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Trade accounts payable and accrued expenses | $ 29,771 | $ 33,021 | $ 32,422
Deferred revenue from contracts with customers |  |  |
Deferred taxes |  |  | 1,402
Retained earnings | 368,205 | 350,423 | 321,323
Adjustments due ASC 606 [Member] |  |  |
Trade accounts payable and accrued expenses |  |  | (4,000)
Deferred revenue from contracts with customers |  |  | 6,950
Deferred taxes |  |  | (723)
Retained earnings |  |  | (2,227)
After Adjustment [Member] |  |  |
Trade accounts payable and accrued expenses |  |  | 28,422
Deferred revenue from contracts with customers | $ 9,623 | $ 7,477 | 6,950
Deferred taxes |  |  | 679
Retained earnings |  |  | $ 319,096

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