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ACCUMULATED OTHER COMPREHENSIVE LOSS (Reclassification out of AOCI) (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net | $ 905,000 | $ (427,000) | $ (564,000) | $ 2,983,000 | $ (4,061,000) | $ (996,000) | $ 846,000 | $ (299,000) | $ 2,897,000 | $ (4,510,000) | $ (6,119,000)
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 78,670,000 | 81,094,000 | 85,808,000
Unrealized (Losses) Gains on Available-for-Sale Securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net |  |  |  |  |  |  |  |  | (332,000) | 0 | (222,000)
Unrealized Loss on Interest Rate Hedge |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | $ (2,335,000) | $ (806,000) | $ 0

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