Annual report pursuant to Section 13 and 15(d)

REVENUE (Tables)

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REVENUE (Tables)
12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Revenue, classified

Sales and usage-based taxes are excluded from revenues. No sales to an individual customer or in a country other than the United States accounted for more than 10% of the sales for the periods listed on the following table. Revenue, classified by the major geographic areas in which our customers are located, was as follows:

REVENUE (Details 2)  
Changes in unearned revenue

Deferred revenue recognized for the year ended December 31, 2019 and 2018 was $165.0 million and $156.6 million, respectively. Changes in unearned revenue were as follows: