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CAPITAL STOCK AND STOCK AWARD PLANS - Summary of Total Compensation Expense Recognized in Statements of Operations for Stock-Based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 41,805 | $ 37,565 | $ 57,661
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 10,109 | 9,178 | 14,607
Stock awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 29,217 | 25,912 | 40,785
Company expense on ESPP discount |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 2,479 | $ 2,475 | $ 2,269

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