Employee Benefit Plans - Tax Effect on Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Amounts in Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Benefit Costs
Estimated amortization of actuarial loss	$ 1,800
Estimated amortization of prior service cost	100
Net actuarial loss	(8,059)	$ (9,301)
Deferred tax benefit	$ 2,000	$ 1,700

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319

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- References

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- Definition

Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

+ 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
-Subparagraph (s)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

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- Definition

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

+ References

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