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Changes in Accumulated Other Comprehensive Loss Reclassification of Adjustments out of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net of Tax | $ 167 |  |
Actuarially Determined Long-Term Liability Adjustments (Note 16) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI before tax | 225 | $ 109 | $ 20,268
Reclassification from AOCI, tax (benefit) | 58 | 173 | 7,499
Net of Tax | 167 | (64) | 12,769
Amortization of Prior Service Costs |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI before tax | (17) | (193) | (2,775)
Recognized Net Actuarial Loss |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI before tax | $ 242 | $ 302 | $ 23,043

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