Accumulated Other Comprehensive (Loss) Income - Summary of Components of Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Foreign currency transaction loss
Foreign currency transaction gain (loss)	$ 2,473	$ 1,740		$ 2,828	$ (2,658)
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period				(97,739)
Total accumulated other comprehensive (loss) income, end of period	(95,718)			(95,718)
Accumulated other comprehensive (loss) income
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	(95,903)	(75,862)		(97,739)	(78,960)
Gain (Loss) recognized in OCI, Net	(502)		$ 793	(228)	1,742
Gain (Loss) reclassified from AOCI to income, Net	687		989	2,249	3,138
Total accumulated other comprehensive (loss) income, end of period	(95,718)	(74,080)	(75,862)	(95,718)	(74,080)
Changes in fair market value of hedges
Changes in AOCI, Gross
Gross, beginning of the period	1,036	1,418		1,316	289
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(529)		1,023	(181)	2,420
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(426)		(217)	(1,054)	(485)
Gross, ending balance	81	2,224	1,418	81	2,224
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	(234)	(360)		(298)	(105)
Income tax (benefit), Gain (Loss) recognized in OCI	119		(231)	41	(547)
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	96		49	238	110
Income tax (benefit), ending of period	(19)	(542)	(360)	(19)	(542)
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	802	1,058		1,018	184
Gain (Loss) recognized in OCI, Net	(410)		792	(140)	1,873
Gain (Loss) reclassified from AOCI to income, Net	(330)		(168)	(816)	(375)
Total accumulated other comprehensive (loss) income, end of period	62	1,682	1,058	62	1,682
Changes in unrealized pension cost
Changes in AOCI, Gross
Gross, beginning of the period	(129,810)	(127,055)		(132,454)	(130,096)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0		0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,313		1,491	3,957	4,532
Gross, ending balance	(128,497)	(125,564)	(127,055)	(128,497)	(125,564)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	35,297	52,152		35,893	52,837
Income tax (benefit), Gain (Loss) recognized in OCI	0		0	0	0
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	(296)		(334)	(892)	(1,019)
Income tax (benefit), ending of period	35,001	51,818	52,152	35,001	51,818
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	(94,513)	(74,903)		(96,561)	(77,259)
Gain (Loss) recognized in OCI, Net	0		0	0	0
Gain (Loss) reclassified from AOCI to income, Net	1,017		1,157	3,065	3,513
Total accumulated other comprehensive (loss) income, end of period	(93,496)	(73,746)	(74,903)	(93,496)	(73,746)
Cumulative translation adjustment
Changes in AOCI, Gross
Gross, beginning of the period	(2,287)	(2,115)		(2,291)	(1,985)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(89)		1	(85)	(129)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0		0	0	0
Gross, ending balance	(2,376)	(2,114)	(2,115)	(2,376)	(2,114)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	95	98		95	100
Income tax (benefit), Gain (Loss) recognized in OCI	(3)		0	(3)	(2)
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	0		0	0	0
Income tax (benefit), ending of period	92	98	98	92	98
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	(2,192)	(2,017)		(2,196)	(1,885)
Gain (Loss) recognized in OCI, Net	(92)		1	(88)	(131)
Gain (Loss) reclassified from AOCI to income, Net	0		0	0	0
Total accumulated other comprehensive (loss) income, end of period	$ (2,284)	$ (2,016)	$ (2,017)	$ (2,284)	$ (2,016)

Accumulated Other Comprehensive Income Loss Tax

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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 of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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

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