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REVENUES (Schedule of Consolidated Statements of Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues | $ 343,874 | $ 332,033 | $ 293,641
Gross profit | 116,169 | $ 107,335 | $ 99,162
As Reported [Member] |  |  |
Revenues | 343,874 |  |
Cost of revenues | 227,705 |  |
Gross profit | 116,169 |  |
Impact of Adoption [Member] |  |  |
Revenues | (741) |  |
Cost of revenues | (84) |  |
Gross profit | (657) |  |
Amounts under Topic 605 [Member] |  |  |
Revenues | 343,133 |  |
Cost of revenues | 227,621 |  |
Gross profit | $ 115,512 |  |

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