Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated other comprehensive loss
Accumulated other comprehensive loss	$ (97,739)	$ (78,960)	$ (93,194)
Gain (Loss) recognized in OCI, Net	1,184	605
Gain (Loss) reclassified from AOCI to income, Net	(2,530)	13,629
Adjustment due to New Accounting Pronouncement	(17,433)
Defined benefit pension item
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	289	116
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	(105)	(42)
Accumulated other comprehensive loss	1,018	184	74
Gain (Loss) recognized in OCI, Gross	1,932	264
Gain (Loss) recognized in OCI, Income tax (benefit)	(437)	(96)
Gain (Loss) recognized in OCI, Net	1,495	168
Gain (Loss) reclassified from AOCI to income, Gross	(905)	(91)
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	205	33
Gain (Loss) reclassified from AOCI to income, Net	(700)	(58)
Adjustment due to New Accounting Pronouncement	39
Accumulated other comprehensive (loss) income, Gross, Ending balance	1,316	289
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	(298)	(105)
Accumulated Defined Benefit Plans Adjustment
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(130,096)	(151,618)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	52,837	60,672
Accumulated other comprehensive loss	(96,561)	(77,259)	(90,946)
Gain (Loss) recognized in OCI, Gross	0	0
Gain (Loss) recognized in OCI, Income tax (benefit)	0	0
Gain (Loss) recognized in OCI, Net	0	0
Gain (Loss) reclassified from AOCI to income, Gross	(2,358)	21,522
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	528	(7,835)
Gain (Loss) reclassified from AOCI to income, Net	(1,830)	13,687
Adjustment due to New Accounting Pronouncement	(17,472)
Accumulated other comprehensive (loss) income, Gross, Ending balance	(132,454)	(130,096)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	35,893	52,837
Unrealized gains and losses on cash flow hedges
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(1,985)	(2,414)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	100	92
Accumulated other comprehensive loss	(2,196)	(1,885)	$ (2,322)
Gain (Loss) recognized in OCI, Gross	(306)	429
Gain (Loss) recognized in OCI, Income tax (benefit)	(5)	8
Gain (Loss) recognized in OCI, Net	(311)	437
Gain (Loss) reclassified from AOCI to income, Gross	0	0
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	0	0
Gain (Loss) reclassified from AOCI to income, Net	0	0
Accumulated other comprehensive (loss) income, Gross, Ending balance	(2,291)	(1,985)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	$ 95	$ 100

Accumulated Other Comprehensive Income Loss Tax

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Adjustment due to New Accounting Pronouncement

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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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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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