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REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |  |
Contract asset (current) | $ 15,914 | $ 16,245
Increase / (decrease) in contract asset (current) | (331) |
Contract asset (long-term) | 0 | 0
Increase / (decrease) in contract assets (long-term) | 0 |
Contract liability (current) | 66,782 | 79,305
Increase / (decrease) in contract liability (current) | (12,523) |
Contract liability (long-term) | 22,035 | 9,779
Increase / (decrease) in contract liability (long-term) | 12,256 |
Revenue recognized previously included in current contract liabilities | 59,600 |
Revenue recognized previously included in current contract liabilities at beginning of the year | 39,100 |
Unearned revenue associated with outstanding contracts | 487 | 515
Estimated revenue to be recognized in 2020 | 55 |
Estimated revenue to be recognized in 2021 | 131 |
Estimated revenue to be recognized after 2021 | 301 |
Allowance for Credit Loss [Abstract] |  |
Accounts and note receivable | 593,418 | 558,428
Accounts and notes receivable, allowance for doubtful accounts (in dollars) | $ 7,440 | $ 3,626

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