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Employee Benefit Plans 8 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Post-Retirement Medical Benefits
Employee benefit plans
Employer contributions	$ 269	$ 170
Pension Benefits
Employee benefit plans
Employer contributions	3,718	$ 3,913
Expected future employer's contribution	$ 3,600
Minimum | Fixed income fund | Post-Retirement Medical Benefits
Employee benefit plans
Maturity period of investments	1 year
Maximum | Fixed income fund | Post-Retirement Medical Benefits
Employee benefit plans
Maturity period of investments	20 years

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