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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ 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
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 73,962 | $ 80,092 | $ 79,981 | $ 76,576 | $ 65,355 | $ 64,968 | $ 60,335 | $ 61,354 | $ 310,611 | $ 252,012 | $ 245,893
Gross profit | 21,570 | 23,762 | 23,517 | 22,554 | 20,551 | 19,546 | 17,881 | 17,701 | 91,403 | 75,679 | 73,004
Net income | $ 2,636 | $ 4,860 | $ 4,231 | $ 4,198 | $ 95 | $ 3,057 | $ 2,227 | $ 2,657 | $ 15,925 | $ 8,036 | $ 9,078
Basic earnings per share (in dollars per share) | $ 0.28 | $ 0.52 | $ 0.46 | $ 0.45 | $ 0.01 | $ 0.33 | $ 0.24 | $ 0.29 | $ 1.72 | $ 0.88 | $ 1.01
Diluted earnings per share (in dollars per share) | $ 0.28 | $ 0.52 | $ 0.45 | $ 0.45 | $ 0.01 | $ 0.33 | $ 0.24 | $ 0.29 | $ 1.70 | $ 0.87 | $ 1.00

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