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Employee Benefit Plans 7 (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee benefit plans
Fair Value	$ 213,147	$ 192,477	$ 162,529
Unfunded Commitments	0	0
Cash equivalents
Employee benefit plans
Fair Value	589	600
Unfunded Commitments	0	0
Fixed income fund
Employee benefit plans
Fair Value	76,221	74,123
Unfunded Commitments	0	0
Total equity funds
Employee benefit plans
Fair Value	126,002	108,775
Unfunded Commitments	0
U.S. small/mid cap funds
Employee benefit plans
Fair Value	21,837	17,865
Unfunded Commitments	0	0
U.S. large cap funds
Employee benefit plans
Fair Value	53,677	47,132
Unfunded Commitments	0	0
International funds
Employee benefit plans
Fair Value	50,488	43,778
Unfunded Commitments	0	0
Real estate funds
Employee benefit plans
Fair Value	10,335	8,979
Unfunded Commitments	$ 0	$ 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.

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