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ACQUISITIONS (Pro Forma) (Details) - Vitruvian acquisition - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Pro forma revenue | $ 265,498 | $ 958,354
Pro forma net income | $ 18,235 | $ 300,052
Pro forma earnings per share (basic) (in usd per share) | $ 0.10 | $ 1.68
Pro forma earnings per share (diluted) (in usd per share) | $ 0.10 | $ 1.68

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