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REVENUE RECOGNITION - Schedule of Customer Assets & Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Accounts receivable |  |
Beginning balance | $ 174,310 | $ 149,122
Increase (decrease), net | (5,808) | 25,188
Ending balance | 168,502 | 174,310
Unbilled accounts receivable |  |
Beginning balance | 13,543 | 16,034
Increase (decrease), net | 10,661 | (2,491)
Ending balance | 24,204 | 13,543
Deferred revenue (current) |  |
Beginning balance | 105,087 | 100,571
Increase (decrease), net | (4,681) | 4,516
Ending balance | 100,406 | 105,087
Deferred revenue (long-term) |  |
Beginning balance | 17,572 | 14,184
Increase (decrease), net | 2,910 | 3,388
Ending balance | $ 20,482 | $ 17,572

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