Accumulated Other Comprehensive (Loss) Income - Summary of Components of Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Foreign currency transaction loss
Foreign currency transaction gain (loss)	$ (1,271)	$ 474
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, end of period	(94,994)		$ (91,726)
Accumulated Other Comprehensive Earnings/(Loss)
AOCI Attributable to Parent, Net of Tax
Gain (Loss) recognized in OCI, Net	(4,336)	335
Gain (Loss) reclassified from AOCI to income, Net	1,068	856
Total accumulated other comprehensive (loss) income, end of period	(94,994)	(96,548)	(91,726)	$ (97,739)
Changes in fair market value of hedges
Changes in AOCI, Gross
Gross, beginning of the period	659	1,316
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(5,422)	315
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(281)	(215)
Gross, ending balance	(5,044)	1,416
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	(150)	(298)
Income tax (benefit), Gain (Loss) recognized in OCI	1,225	(71)
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	64	49
Income tax (benefit), ending of period	1,139	(320)
AOCI Attributable to Parent, Net of Tax
Gain (Loss) recognized in OCI, Net	(4,197)	244
Gain (Loss) reclassified from AOCI to income, Net	(217)	(166)
Total accumulated other comprehensive (loss) income, end of period	(3,905)	1,096	509	1,018
Changes in unrealized pension cost
Changes in AOCI, Gross
Gross, beginning of the period	(124,140)	(132,454)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,660	1,319
Gross, ending balance	(122,480)	(131,135)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	34,018	35,893
Income tax (benefit), Gain (Loss) recognized in OCI	0	0
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	(375)	(297)
Income tax (benefit), ending of period	33,643	35,596
AOCI Attributable to Parent, Net of Tax
Gain (Loss) recognized in OCI, Net	0	0
Gain (Loss) reclassified from AOCI to income, Net	1,285	1,022
Total accumulated other comprehensive (loss) income, end of period	(88,837)	(95,539)	(90,122)	(96,561)
Cumulative translation adjustment
Changes in AOCI, Gross
Gross, beginning of the period	(2,211)	(2,291)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(41)	88
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0
Gross, ending balance	(2,252)	(2,203)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	98	95
Income tax (benefit), Gain (Loss) recognized in OCI	(98)	3
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	0	0
Income tax (benefit), ending of period	0	98
AOCI Attributable to Parent, Net of Tax
Gain (Loss) recognized in OCI, Net	(139)	91
Gain (Loss) reclassified from AOCI to income, Net	0	0
Total accumulated other comprehensive (loss) income, end of period	$ (2,252)	$ (2,105)	$ (2,113)	$ (2,196)

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

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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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