Pension plan and 401(k) Program - Changes in Unrecognized Pension Cost (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Changes in Unrecognized pension cost, pre-tax
Unrecognized pension cost, pre-tax, beginning of year	$ (4,479)	$ (2,561)
Amortization during year	160	(19)
Actuarial (losses) gains	(2,904)	(771)
Asset (losses) gains	(1,034)	(1,140)
Translation adjustments and other	1	12
Unrecognized pension cost, pre-tax, end of year	$ (8,256)	$ (4,479)

Other Comprehensive Income (Loss), Defined Benefit Plan, Actuarial Gain (Loss) Arising During Period, Before Tax

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- Definition

Other Comprehensive Income (Loss), Defined Benefit Plan, Plan Asset Gain (Loss) Arising During Period, before Tax

+ References

No definition available.

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- Definition

Other Comprehensive Income (Loss), Defined Benefit Plan, Translation Adjustments, Before Tax

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- Definition

Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income [Roll Forward]

+ References

No definition available.

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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 14A
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- Definition

Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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-Publisher FASB
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-Name Accounting Standards Codification
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