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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Payment Arrangement, Amount Capitalized $ 1,100 $ 1,300
Share-based Payment Arrangement, Noncash Expense 14,015 16,411
Cost of Sales [Member]    
Share-based Payment Arrangement, Noncash Expense 259 378
Selling and Marketing Expense [Member]    
Share-based Payment Arrangement, Noncash Expense 874 1,425
Selling, General and Administrative Expenses [Member]    
Share-based Payment Arrangement, Noncash Expense 12,882 $ 14,608
Restricted Stock Units (RSUs)    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 92,400  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 5 months 4 days