Retirement Plans and Postretirement Medical Benefits (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Percent of all foreign plan assets	79.00%
Assumed health care cost trend rate	6.80%	7.00%
Next year's assumed health care cost trend rate	6.50%
Assumed health care cost trend rate decline	5.00%
Total contributions to defined contribution plans	$ 27,000	$ 28,000
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,820	17,132
Unfunded Plan | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		8,000
Nonpension postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0	$ 0
United States
Defined Benefit Plan Disclosure [Line Items]
Next year's anticipated total contributions to pension plans	6,000
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,549,157	1,601,786	$ 1,487,018
United States | Pension Benefits | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Funded percentage			1.10%
Foreign
Defined Benefit Plan Disclosure [Line Items]
Next year's anticipated total contributions to pension plans	10,000
Foreign | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 737,443	$ 742,639	$ 668,308