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SEGMENT INFORMATION - Assets by Region (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets $ 653,542 $ 588,348
United States    
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets 516,449 451,436
Foreign countries    
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets $ 137,093 $ 136,912