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QUARTERLY SUPPLEMENTAL 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 | [1],[2] | Sep. 30, 2017 | Jun. 30, 2017 | [1] | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 70,143 | $ 77,550 | $ 56,149 | $ 43,572 | $ 115,867 | $ 61,683 | $ 102,513 | $ 55,566 | $ 247,414 | $ 335,629 | $ 198,886 |
Net income | $ 19,249 | $ 22,818 | $ 10,814 | $ 5,959 | $ 32,813 | $ 13,520 | $ 47,187 | $ 10,365 | $ 58,840 | $ 103,885 | $ 48,070 | $ 48,070
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.40 | $ 0.48 | $ 0.23 | $ 0.13 | $ 0.70 | $ 0.28 | $ 0.99 | $ 0.22 | $ 1.24 | $ 2.19 | $ 1.02 | $ 1.02
Diluted | $ 0.40 | $ 0.48 | $ 0.23 | $ 0.13 | $ 0.69 | $ 0.28 | $ 0.99 | $ 0.22 | $ 1.24 | $ 2.18 | $ 1.02 | $ 1.02
[1] | Prior to the adoption of ASC 606 on January 1, 2018, the Company recorded as revenue the receipt of the semi-annual license fee payment of $45.0 million from SDC in the second and fourth quarters.
[2] | The enactment of the Tax Cuts and Jobs Act in December 2017 resulted in a one-time charge of $11.5 million in the fourth quarter.

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