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Employee Benefit Plans Employee Benefit Plans 8 (Details) - Post-Retirement Medical Benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee benefit plans
Fair value of post-retirement plan assets	$ 10,010	$ 11,053	$ 10,538
Level 1
Employee benefit plans
Fair value of post-retirement plan assets	10,010	11,060
Level 2
Employee benefit plans
Fair value of post-retirement plan assets	0	0
Level 3
Employee benefit plans
Fair value of post-retirement plan assets	0	0
Cash equivalents | Level 1
Employee benefit plans
Fair value of post-retirement plan assets	263	189
Cash equivalents | Level 2
Employee benefit plans
Fair value of post-retirement plan assets	0	0
Cash equivalents | Level 3
Employee benefit plans
Fair value of post-retirement plan assets	0	0
Fixed income fund | Level 1
Employee benefit plans
Fair value of post-retirement plan assets	3,871	4,364
Fixed income fund | Level 2
Employee benefit plans
Fair value of post-retirement plan assets	0	0
Fixed income fund | Level 3
Employee benefit plans
Fair value of post-retirement plan assets	0	0
U.S. large cap funds | Level 1
Employee benefit plans
Fair value of post-retirement plan assets	5,876	6,507
U.S. large cap funds | Level 2
Employee benefit plans
Fair value of post-retirement plan assets	0	0
U.S. large cap funds | Level 3
Employee benefit plans
Fair value of post-retirement plan assets	0	0
Fair Value
Employee benefit plans
Fair value of post-retirement plan assets	10,010	11,060
Fair Value | Cash equivalents
Employee benefit plans
Fair value of post-retirement plan assets	263	189
Fair Value | Fixed income fund
Employee benefit plans
Fair value of post-retirement plan assets	3,871	4,364
Fair Value | U.S. large cap funds
Employee benefit plans
Fair value of post-retirement plan assets	$ 5,876	$ 6,507
Minimum | Fixed income fund
Employee benefit plans
Investments Maturity Period	1 year
Maximum | Fixed income fund
Employee benefit plans
Investments Maturity Period	20 years

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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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