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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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