SEGMENT AND GEOGRAPHIC INFORMATION (Total Revenue by Major Geographic Area) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenue, net	$ 395,127,000	$ 379,095,000	$ 383,645,000	$ 359,690,000	$ 383,315,000	$ 365,854,000	$ 366,190,000	$ 357,082,000	$ 1,517,557,000	$ 1,472,441,000	$ 1,188,236,000
Total long-lived assets	446,718,000				320,029,000				446,718,000	320,029,000
United States (Includes long-lived assets in Puerto Rico)
Segment Reporting Information [Line Items]
Total revenue, net									1,077,379,000	1,045,887,000	894,260,000
Total long-lived assets	383,652,000				280,382,000				383,652,000	280,382,000
Europe
Segment Reporting Information [Line Items]
Total revenue, net									197,468,000	201,354,000	150,147,000
Total long-lived assets	47,325,000				32,679,000				47,325,000	32,679,000
Asia Pacific
Segment Reporting Information [Line Items]
Total revenue, net									157,391,000	144,253,000	80,636,000
Total long-lived assets	8,598,000				3,765,000				8,598,000	3,765,000
Rest of the World
Segment Reporting Information [Line Items]
Total revenue, net									85,319,000	80,947,000	$ 63,193,000
Total long-lived assets	$ 7,143,000				$ 3,203,000				$ 7,143,000	$ 3,203,000