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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Feb. 28, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Available-for-sale Securities   $ 25,646   $ 26,785  
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   $ 0 $ 14,600 $ 0 $ 14,588
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options   883,180   885,580  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price   $ 0.61   $ 0.62  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   1 year 6 months 2 days   1 year 9 months 2 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   $ 3,294   $ 3,967  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 3.78      
Stock-based compensation   $ 19,326 $ 19,701    
Stock Issued During Period, Shares, Employee Stock Purchase Plans     877,845    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   3,283,114      
Stock Issued During Period, Shares, Issued for Services   278,635      
Common Stock, No Par Value       $ 5.20  
Performance Share Units, Total Grant Date Fair Value, Conditions Met   $ 8,500      
Deferred Compensation Arrangement with Individual, Shares Issued   1,240,379      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number   (2,400)      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price   $ 2.36      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares   0      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price   $ 0.00      
Fair Value, Measurement with Unobservable Inputs, Unrealized Gain Loss [1]   $ 0 $ 12    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%      
Preferred Stock, Capital Shares Reserved for Future Issuance   50,000,000      
Preferred Stock, Shares Outstanding   0   0  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   2,010,000,000      
Stock Repurchase Program, Authorized Amount   $ 300,000      
Payments for Repurchase of Common Stock $ 135,200 $ 0 27,234    
Common Stock, Capital Shares Reserved for Future Issuance   63,923,154      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost   $ 1,700 1,500    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 107,900      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year 3 months 25 days      
Carrying Amount [2]       $ 25,438  
Cost of Sales [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation     663    
Selling and Marketing Expense [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation   $ 1,794 1,802    
Selling, General and Administrative Expenses [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation   17,088 17,185    
Other Income [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation   48 $ 51    
Cost of Sales [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation   396      
Convertible Debt Securities | Fair Value, Measurements, Recurring          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Available-for-sale Securities   11,070   11,354  
Convertible Debt Securities | Fair Value, Measurements, Recurring | Level 1          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Available-for-sale Securities   0   0  
Convertible Debt Securities | Fair Value, Measurements, Recurring | Level 2          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Available-for-sale Securities   0   0  
Redeemable Preferred Stock | Fair Value, Measurements, Recurring          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Available-for-sale Securities   14,576   15,431  
Redeemable Preferred Stock | Fair Value, Measurements, Recurring | Level 1          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Available-for-sale Securities   0   0  
Redeemable Preferred Stock | Fair Value, Measurements, Recurring | Level 2          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Available-for-sale Securities   $ 0   $ 0  
Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares   26,063,046   28,939,110  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value   $ 4.40   $ 4.32  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   2,610,912      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 5.24      
Vesting of restricted stock units and performance share units (in shares)   3,878,827      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value   $ 4.53      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (1,608,149)      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value   $ 4.02      
Minimum | Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   3 years      
Maximum | Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   4 years      
[1] (1)Represents the unrealized losses or gains recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.
[2] (1)See Note 2, Adoption of New Accounting Standards, and Note 5, Investments, for information about the Company's adoption of ASU 2016-01 on January 1, 2018 and its impact on accounting for equity investments without readily determinable fair values that were previously subject to the cost method of accounting.