Accumulated Other Comprehensive (Loss) Income - Summary of Components of Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Foreign currency transaction loss
Foreign currency transaction gain (loss)	$ 829	$ 2,194	$ 355	$ (918)
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	(95,903)		(95,903)
Accumulated other comprehensive (loss) income
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	(96,548)	(76,803)	(97,739)	(78,960)
Gain (Loss) recognized in OCI, Net	(62)	(189)	274	950
Gain (Loss) reclassified from AOCI to income, Net	707	1,130	1,562	2,148
Total accumulated other comprehensive (loss) income, end of period	(95,903)	(75,862)	(95,903)	(75,862)
Changes in fair market value of hedges
Changes in AOCI, Gross
Gross, beginning of the period	1,416	1,332	1,316	289
Other Comprehensive Income (Loss), before Reclassifications, before Tax	32	240	348	1,397
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(412)	(154)	(628)	(268)
Gross, ending balance	1,036	1,418	1,036	1,418
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	(320)	(341)	(298)	(105)
Income tax (benefit), Gain (Loss) recognized in OCI	(7)	(54)	(78)	(315)
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	93	35	142	60
Income tax (benefit), ending of period	(234)	(360)	(234)	(360)
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	1,096	991	1,018	184
Gain (Loss) recognized in OCI, Net	25	186	270	1,082
Gain (Loss) reclassified from AOCI to income, Net	(319)	(119)	(486)	(208)
Total accumulated other comprehensive (loss) income, end of period	802	1,058	802	1,058
Changes in unrealized pension cost
Changes in AOCI, Gross
Gross, beginning of the period	(131,135)	(128,672)	(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	1,325	1,617	2,644	3,041
Gross, ending balance	(129,810)	(127,055)	(129,810)	(127,055)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	35,596	52,520	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	(299)	(368)	(596)	(685)
Income tax (benefit), ending of period	35,297	52,152	35,297	52,152
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	(95,539)	(76,152)	(96,561)	(77,259)
Gain (Loss) recognized in OCI, Net	0	0	0	0
Gain (Loss) reclassified from AOCI to income, Net	1,026	1,249	2,048	2,356
Total accumulated other comprehensive (loss) income, end of period	(94,513)	(74,903)	(94,513)	(74,903)
Cumulative translation adjustment
Changes in AOCI, Gross
Gross, beginning of the period	(2,203)	(1,747)	(2,291)	(1,985)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(84)	(368)	4	(130)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0	0
Gross, ending balance	(2,287)	(2,115)	(2,287)	(2,115)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	98	105	95	100
Income tax (benefit), Gain (Loss) recognized in OCI	(3)	(7)	0	(2)
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	0	0	0	0
Income tax (benefit), ending of period	95	98	95	98
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	(2,105)	(1,642)	(2,196)	(1,885)
Gain (Loss) recognized in OCI, Net	(87)	(375)	4	(132)
Gain (Loss) reclassified from AOCI to income, Net	0	0	0	0
Total accumulated other comprehensive (loss) income, end of period	$ (2,192)	$ (2,017)	$ (2,192)	$ (2,017)

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

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