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Employee benefits - Funded Status of the plan (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Funded status of the plan: |  |  |
Fair value of plan assets at end of year | $ 799,935 | $ 685,823 |
Pension Plans |  |  |
Funded status of the plan: |  |  |
Benefit obligation at end of year | 852,551 | 754,558 | $ 816,988
Fair value of plan assets at end of year | 799,935 | 685,823 | 767,539
Funded status at year end | (52,616) | (68,735) | (49,449)
OPEB Plan |  |  |
Funded status of the plan: |  |  |
Benefit obligation at end of year | 168,681 | 153,415 | 170,720
Fair value of plan assets at end of year | 0 | 0 | 0
Funded status at year end | $ (168,681) | $ (153,415) | $ (170,720)

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