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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 179,968 | $ 195,690 | $ 176,888 | $ 159,160 | $ 159,716 | $ 153,363 | $ 153,089 | $ 148,933 | $ 711,706 | $ 615,101 | $ 601,119
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |  |  |
Costs of Operations |  |  |  |  |  |  |  |  | 628,370 | 548,000 | 536,840
Income Tax Provision |  |  |  |  |  |  |  |  | 7,917 | 7,323 | 11,155
Net Income | $ 10,799 | $ 8,677 | $ 7,600 | $ 6,670 | $ 9,296 | $ 4,456 | $ 5,425 | $ 3,839 | 33,746 | $ 23,016 | $ 19,922
ASU 2014-09 | Balances Without Adoption of ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 711,672 |  |
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |  |  |
Costs of Operations |  |  |  |  |  |  |  |  | 628,343 |  |
Income Tax Provision |  |  |  |  |  |  |  |  | 7,916 |  |
Net Income |  |  |  |  |  |  |  |  | 33,740 |  |
ASU 2014-09 | Effect of Adoption Increase/(Decrease) |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 34 |  |
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |  |  |
Costs of Operations |  |  |  |  |  |  |  |  | 27 |  |
Income Tax Provision |  |  |  |  |  |  |  |  | 1 |  |
Net Income |  |  |  |  |  |  |  |  | $ 6 |  |

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