Retirement Plans and Postretirement Medical Benefits (Fair Value Measurements of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 4,940	$ 5,615
United States | Total plan assets at fair value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	958,812	1,153,490
United States | Total plan assets at fair value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	158,047	170,540
United States | Total plan assets at fair value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	948,543	1,064,741
United States | Total plan assets at fair value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	45,221	67,256
United States | Total plan assets at fair value | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,151,811	1,302,537
United States | Money market funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Money market funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,461	13,842
United States | Money market funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Money market funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,461	13,842
United States | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	67,945	102,795
United States | Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Equity securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	67,945	102,795
United States | Commingled fixed income securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Commingled fixed income securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	185,212	220,041
United States | Commingled fixed income securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Commingled fixed income securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	185,212	220,041
United States | Government and related securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	158,047	170,540
United States | Government and related securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37,880	28,518
United States | Government and related securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Government and related securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	195,927	199,058
United States | Corporate debt securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Corporate debt securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	498,867	545,615
United States | Corporate debt securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Corporate debt securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	498,867	545,615
United States | Mortgage-backed /asset-backed securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Mortgage-backed /asset-backed securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39,046	49,300
United States | Mortgage-backed /asset-backed securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Mortgage-backed /asset-backed securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39,046	49,300
United States | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	45,221	67,256	$ 91,500
United States | Real estate | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Real estate | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Real estate | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	45,221	67,256
United States | Real estate | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	45,221	67,256
United States | Securities lending collateral | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Securities lending collateral | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	109,132	104,630
United States | Securities lending collateral | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Securities lending collateral | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	109,132	104,630
United States | Securities lending payable
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(109,132)	(104,630)
United States | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	466	1,240
United States | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(89,273)	(51,272)
Foreign | Total plan assets at fair value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	408,205	466,687
Foreign | Total plan assets at fair value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Total plan assets at fair value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	300,295	416,476
Foreign | Total plan assets at fair value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	92,330	43,205
Foreign | Total plan assets at fair value | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	392,625	459,681
Foreign | Money market funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Money market funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,400	5,997
Foreign | Money market funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Money market funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,400	5,997
Foreign | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,958	44,088
Foreign | Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Equity securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,958	44,088
Foreign | Commingled fixed income securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Commingled fixed income securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	212,425	295,105
Foreign | Commingled fixed income securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Commingled fixed income securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	212,425	295,105
Foreign | Government and related securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Government and related securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	31,962	38,028
Foreign | Government and related securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Government and related securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	31,962	38,028
Foreign | Corporate debt securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Corporate debt securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20,875	28,389
Foreign | Corporate debt securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Corporate debt securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20,875	28,389
Foreign | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	43,930	43,205	$ 42,980
Foreign | Real estate | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign | Real estate | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,675	4,869
Foreign | Real estate | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	43,930	43,205
Foreign | Real estate | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47,605	48,074
Foreign | Diversified growth funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Foreign | Diversified growth funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Foreign | Diversified growth funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	48,400
Foreign | Diversified growth funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	48,400
Foreign | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,644	6,501
Foreign | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,936	$ 505