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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS Stock-Based Compensation (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 215,187   215,187   885,580
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price $ 1.80   $ 1.80   $ 0.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     1 year 7 months 17 days   1 year 9 months 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 424,000   $ 424,000   $ 3,967,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 5 $ 3.78  
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Issuable 6,905,418   6,905,418    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     7,972,780    
Stock-based compensation $ 15,026,000 $ 19,177,000 $ 50,670,000 $ 60,318,000  
Stock Issued During Period, Shares, Employee Stock Purchase Plans       0  
Common Stock, No Par Value $ 1,240,379   $ 1,240,379    
Performance Share Units, Total Grant Date Fair Value, Conditions Met $ 10,000,000   $ 10,000,000    
Deferred Compensation Arrangement with Individual, Shares Issued     278,635    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number     (670,393)    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price     $ 0.11    
Fair Value, Measurement with Unobservable Inputs, Unrealized Gain Loss [1] $ 21,000 0 $ 35,000 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,010,000,000   2,010,000,000    
Preferred Stock, Capital Shares Reserved for Future Issuance 50,000,000   50,000,000    
Stock Repurchase Program, Authorized Amount $ 300,000,000   $ 300,000,000    
Payments for Repurchase of Common Stock     $ 0 61,233,000  
Common Stock, Capital Shares Reserved for Future Issuance 54,556,190   54,556,190    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 2,000,000 1,400,000 $ 5,700,000 4,700,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 112,200,000   $ 112,200,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 4 months 9 days    
Carrying Amount [2]         $ 25,438,000
Cost of Sales          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation   582,000   2,039,000  
Cost of Sales          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation 419,000   $ 1,103,000    
Selling and Marketing Expense          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation 1,854,000 1,797,000 5,411,000 5,829,000  
Selling, General and Administrative Expenses          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation 12,753,000 15,856,000 44,056,000 51,409,000  
Restructuring Charges          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation 0 849,000 0 849,000  
Other Income          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation $ 0 $ 93,000 $ 100,000 $ 192,000  
Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares 29,024,815   29,024,815   28,939,110
Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price $ 4.54   $ 4.54   $ 4.32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     16,036,764    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 4.75    
Vesting of restricted stock units and performance share units (in shares)     10,728,624    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value     $ 4.40    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (5,222,435)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value     $ 4.30    
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 10,000,000   10,000,000    
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     1 year    
Minimum | Employee Stock Option          
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    
Maximum | Employee Stock Option          
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    
Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting of restricted stock units and performance share units (in shares)     11,007,259    
Stock Issued During Period, Shares, Employee Stock Purchase Plans     1,621,061 1,879,656  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number     (670,393)    
[1] (1)Represents the unrealized gains or losses 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 6, Investments, for information about our 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.