Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated other comprehensive loss
Accumulated other comprehensive loss	$ (91,726)	$ (97,739)	$ (78,960)
Gain (Loss) recognized in OCI, Net	691	1,184
Gain (Loss) reclassified from AOCI to income, Net	5,322	(2,530)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		0
Defined benefit pension item
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	1,316	289
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	(298)	(105)
Accumulated other comprehensive loss	509	1,018	184
Gain (Loss) recognized in OCI, Gross	786	1,932
Gain (Loss) recognized in OCI, Income tax (benefit)	(178)	(437)
Reclassification from AOCI, Current Period, Tax	326
Gain (Loss) recognized in OCI, Net	608	1,495
Gain (Loss) reclassified from AOCI to income, Gross	(1,443)	(905)
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)		205
Gain (Loss) reclassified from AOCI to income, Net	(1,117)	(700)
Accumulated other comprehensive (loss) income, Gross, Ending balance	659	1,316
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	(150)	(298)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		39
Accumulated Defined Benefit Plans Adjustment
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(132,454)	(130,096)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	35,893	52,837
Accumulated other comprehensive loss	(90,122)	(96,561)	(77,259)
Gain (Loss) reclassified from AOCI to income, Gross	8,314	(2,358)
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	(1,875)	528
Gain (Loss) reclassified from AOCI to income, Net	6,439	(1,830)
Accumulated other comprehensive (loss) income, Gross, Ending balance	(124,140)	(132,454)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	34,018	35,893
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(17,472)
Unrealized gains and losses on cash flow hedges
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(2,291)	(1,985)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	95	100
Accumulated other comprehensive loss	(2,113)	(2,196)	$ (1,885)
Gain (Loss) recognized in OCI, Gross	80	(306)
Gain (Loss) recognized in OCI, Income tax (benefit)	3	(5)
Gain (Loss) recognized in OCI, Net	83	(311)
Accumulated other comprehensive (loss) income, Gross, Ending balance	(2,211)	(2,291)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	$ 98	95
Accumulated Other Comprehensive Earnings
Accumulated other comprehensive loss
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ (17,433)

Accumulated Other Comprehensive Income Loss Tax

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Reclassification From Accumulated Other Comprehensive Income Current Period Tax

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).

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