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Employee Benefit Plans 9 (Details) - Post-Retirement Medical Benefits - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee benefit plans
Fair value of post-retirement plan assets	$ 13,773	$ 12,313	$ 11,271
Fair Value
Employee benefit plans
Fair value of post-retirement plan assets	13,773	12,312
Level 1
Employee benefit plans
Fair value of post-retirement plan assets	13,773	12,312
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 | Fair Value
Employee benefit plans
Fair value of post-retirement plan assets	92	169
Cash equivalents | Level 1
Employee benefit plans
Fair value of post-retirement plan assets	92	169
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 | Fair Value
Employee benefit plans
Fair value of post-retirement plan assets	5,409	4,436
Fixed income fund | Level 1
Employee benefit plans
Fair value of post-retirement plan assets	5,409	4,436
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. equity securities | Fair Value
Employee benefit plans
Fair value of post-retirement plan assets	8,272	7,707
U.S. equity securities | Level 1
Employee benefit plans
Fair value of post-retirement plan assets	8,272	$ 7,707
U.S. equity securities | Level 2
Employee benefit plans
Fair value of post-retirement plan assets	0
U.S. equity securities | Level 3
Employee benefit plans
Fair value of post-retirement plan assets	$ 0

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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