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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS Stock-based Compensation Expense (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 129,700,000  
Share-based Compensation $ 16,411,000 $ 19,326,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 6 months  
Cost of Sales [Member]    
Share-based Compensation $ 378,000 396,000
Selling and Marketing Expense [Member]    
Share-based Compensation 1,425,000 1,794,000
Selling, General and Administrative Expenses [Member]    
Share-based Compensation 14,608,000 17,088,000
Other Income [Member]    
Share-based Compensation $ 0 $ 48,000