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REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
REVENUE. |  |
Contract asset (current) | $ 15,113 | $ 16,245
Increase / (decrease) in contract asset (current) | (1,132) |
Contract liability (current) | 70,708 | 79,305
Increase / (decrease) in contract liability (current) | (8,597) |
Contract liability (long-term) | 20,662 | 9,779
Increase / (decrease) in contract liability (long-term) | 10,883 |
Revenue recognized previously included in current contract liabilities | 27,300 |
Revenue recognized previously included in current contract liabilities at beginning of the year | 21,600 |
Unearned revenue associated with outstanding contracts | 410 | 515
Estimated revenue to be recognized in 2020 | 111 |
Estimated revenue to be recognized in 2021 | 125 |
Estimated revenue to be recognized after 2021 | 174 |
Allowance for Credit Loss [Abstract] |  |
Accounts and note receivable | 575,655 | 558,428
Accounts and notes receivable, allowance for doubtful accounts (in dollars) | $ 6,080 | $ 3,626

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