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Employee Benefit Plans Employee Benefit Plans 7 (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee benefit plans
Fair Value	$ 162,529	$ 173,648	$ 150,872
Unfunded Commitments	0	0
Cash equivalents
Employee benefit plans
Fair Value	590	489
Unfunded Commitments	0	0
Fixed income fund
Employee benefit plans
Fair Value	70,642	66,669
Unfunded Commitments	0	0
U.S. small/mid cap funds
Employee benefit plans
Fair Value	22,313	26,998
Unfunded Commitments	0	0
U.S. large cap funds
Employee benefit plans
Fair Value	46,133	53,985
Unfunded Commitments	0	0
International funds
Employee benefit plans
Fair Value	15,548	17,893
Unfunded Commitments	0	0
Total equity funds
Employee benefit plans
Fair Value	83,994	98,876
Unfunded Commitments	0
Real estate funds
Employee benefit plans
Fair Value	7,303	7,614
Unfunded Commitments	$ 0	$ 0

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+ References

No definition available.

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258

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