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REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018
REVENUE. |  |
Contract asset (current) | $ 15,858 | $ 13,984
Increase / (decrease) in contract asset (current) | 1,874 |
Contract liability (current) | 68,134 | 45,211
Increase / (decrease) in contract liability (current) | 22,923 |
Contract liability (long-term) | 11,261 | 1,476
Increase / (decrease) in contract liability (long-term) | 9,785 |
Revenue recognized previously included in current contract liabilities | 45,200 |
Unearned revenue associated with outstanding contracts | 759 | $ 839
Estimated revenue to be recognized in 2019 | 359 |
Estimated revenue to be recognized after 2019 | $ 400 |

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