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GOODWILL AND INTANGIBLE ASSETS - Estimated amortization expense (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
VOBA |  |  |  |
2018 | $ 171,124 |  |  |
2019 | 26,722 |  |  |
2020 | 5,139 |  |  |
2021 | 3,853 |  |  |
2022 | 0 |  |  |
2023 and thereafter | 0 |  |  |
Value of business acquired | 206,838 | $ 0 |  |
Intangible assets |  |  |  |
2018 | 13,025 |  |  |
2019 | 11,606 |  |  |
2020 | 11,506 |  |  |
2021 | 11,506 |  |  |
2022 | 11,506 |  |  |
2023 and thereafter | 78,054 |  |  |
Total | 137,203 |  |  |
Indefinite lived intangible assets | 120,784 | 26,036 | $ 26,036 | $ 26,036
Intangible assets | 257,987 | $ 37,901 |  |
Total |  |  |  |
2018 | 184,149 |  |  |
2019 | 38,328 |  |  |
2020 | 16,645 |  |  |
2021 | 15,359 |  |  |
2020 | 11,506 |  |  |
2023 and thereafter | 78,054 |  |  |
Total remaining amortization expense | 344,041 |  |  |
Total intangible assets | $ 464,825 |  |  |

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