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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Components of accumulated other comprehensive loss | $ 121,842 | $ 120,061 | $ 116,942 | $ 114,715
Unrealized (Losses) Gains on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Components of accumulated other comprehensive loss | (109) | (266) | 1,834 |
Pension Liability |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Components of accumulated other comprehensive loss | (5,648) | (5,758) | (5,777) |
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Components of accumulated other comprehensive loss | $ (5,757) | $ (6,024) | $ (3,943) | $ (4,726)

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