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Changes in Accumulated Other Comprehensive Loss Reclassification of Adjustments out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Equity [Abstract] |  |  |  |
Amortization of Prior Service Costs | $ (90) | $ (749) | $ (181) | $ (1,498)
Recognized Net Actuarial Loss | 354 | 6,247 | 708 | 12,550
Total | 264 | 5,498 | 527 | 11,052
Less: Tax Benefit | 94 | 2,034 | 188 | 4,086
Net of Tax | $ 170 | $ 3,464 | $ 339 | $ 6,966

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