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SELECTED QUARTERLY INFORMATION - UNAUDITED (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
Selected Quarterly Financial Information [Abstract]
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
Gross margin	245,665,000	236,459,000	239,974,000	230,778,000	236,851,000	222,609,000	228,625,000	212,860,000	952,876,000	900,945,000
Net income (loss)	$ 15,319,000	$ (27,610,000)	$ 29,736,000	$ 32,756,000	$ 25,138,000	$ 13,295,000	$ 11,376,000	$ 10,992,000	$ 50,201,000	$ 60,801,000	$ 64,743,000
Per Share-Basic (in dollars per share)	$ 0.18	$ (0.32)	$ 0.35	$ 0.38	$ 0.29	$ 0.16	$ 0.14	$ 0.14	$ 0.59	$ 0.73	$ 0.84
Per Share-Diluted (in dollars per share)	$ 0.18	$ (0.32)	$ 0.34	$ 0.38	$ 0.29	$ 0.15	$ 0.14	$ 0.14	$ 0.58	$ 0.72	$ 0.82

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