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REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
REVENUE. |  |
Contract asset (current) | $ 19,044 | $ 15,858
Increase / (decrease) in contract asset (current) | 3,186 |
Contract liability (current) | 59,500 | 68,134
Increase / (decrease) in contract liability (current) | (8,634) |
Contract liability (long-term) | 12,705 | 11,261
Increase / (decrease) in contract liability (long-term) | 1,444 |
Revenue recognized previously included in current contract liabilities | 40,900 |
Revenue recognized previously included in current contract liabilities at beginning of year | 22,600 |
Unearned revenue associated with outstanding contracts | 504 | $ 758
Estimated revenue to be recognized in 2019 | 49 |
Estimated revenue to be recognized in 2020 | 260 |
Estimated revenue to be recognized after 2020 | $ 195 |

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