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SEGMENT INFORMATION - Assets by Region (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets $ 1,578,532 $ 1,382,802
United States    
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets 1,026,884 950,567
Foreign countries    
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets $ 551,648 $ 432,235