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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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