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SELECTED QUARTERLY INFORMATION (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2020 | Dec. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 150,693 | $ 121,129 | $ 106,832 | $ 109,664 | $ 114,457 | $ 114,159 | $ 102,865 | $ 89,188 | $ 488,318 | $ 420,669 | $ 415,955
Gross Profit |  | 74,005 | 59,569 | 53,536 | 56,480 | 58,225 | 58,131 | 51,572 | 45,474 | 243,590 | 213,402 | 214,788
Net income (loss) |  | $ 27,278 | $ 14,820 | $ 13,192 | $ 15,886 | $ 158,291 | $ 17,099 | $ 10,845 | $ 7,233 | $ 71,176 | $ 193,468 | $ 69,984
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ / shares |  | $ 0.46 | $ 0.25 | $ 0.22 | $ 0.27 | $ 2.69 | $ 0.29 | $ 0.19 | $ 0.13 | $ 1.19 | $ 3.31 | $ 1.19
Diluted | $ / shares |  | $ 0.45 | $ 0.24 | $ 0.22 | $ 0.27 | $ 2.64 | $ 0.29 | $ 0.19 | $ 0.13 | $ 1.17 | $ 3.24 | $ 1.16
Shares used in per share calculation |  |  |  |  |  |  |  |  |  |  |  |
Basic | shares |  | 59,879 | 59,823 | 59,712 | 59,204 | 58,854 | 58,770 | 58,594 | 57,902 | 59,657 | 58,534 | 58,912
Diluted | shares |  | 61,176 | 60,852 | 60,624 | 60,268 | 60,010 | 59,732 | 59,404 | 58,892 | 60,845 | 59,632 | 60,294
Litigation settlement |  |  |  |  |  |  |  |  |  | $ 0 | $ 168,969 | $ 0
Stock split ratio | 2 |  |  |  |  |  |  |  |  |  |  |

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