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Retirement Plans and Postretirement Medical Benefits (Fair Value Measurements of Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Document Fiscal Year Focus 2019    
Total assets $ 667,638 $ 919,371  
Cash and cash equivalents 924,442 867,262  
Other 20,403 14,502  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total assets 227,669 321,116  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets 439,969 598,255  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total assets 0 0  
Diversified growth funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 47,621 40,766 $ 44,024
United States      
Defined Benefit Plan Disclosure [Line Items]      
Securities lending payable (106,886) (117,603)  
Cash and cash equivalents 9,409 11,341  
Other (51,885) (58,591)  
Fair value of plan assets 1,487,018 1,327,034  
United States | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 292,506 372,873  
United States | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,248,929 989,387  
United States | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 94,945 129,627  
United States | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,636,380 1,491,887  
United States | Money market funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 3,498  
United States | Money market funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,917 5,759  
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 4,917 9,257  
United States | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 110,840  
United States | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 265,832 109,864  
United States | Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Equities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 265,832 220,704  
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 275,335 281,258  
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 275,335 281,258  
United States | Government and related securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 292,506 258,535  
United States | Government and related securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15,764 16,144  
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 308,270 274,679  
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 528,425 435,285  
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 528,425 435,285  
United States | Mortgage-backed securities /asset-backed securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Mortgage-backed securities /asset-backed securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 51,770 23,474  
United States | Mortgage-backed securities /asset-backed securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Mortgage-backed securities /asset-backed securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 51,770 23,474  
United States | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23,608 32,750 38,362
United States | Private equity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Private equity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Private equity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23,608 32,750  
United States | Private equity | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23,608 32,750  
United States | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 71,337 96,877 91,352
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 71,337 96,877  
United States | Real estate | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 71,337 96,877  
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 106,886 117,603  
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 106,886 117,603  
Foreign      
Defined Benefit Plan Disclosure [Line Items]      
Cash and cash equivalents 1,516 3,903  
Other 484 666  
Fair value of plan assets 668,308 562,517  
Foreign | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 573,352 475,039  
Foreign | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 92,956 82,909  
Foreign | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 666,308 557,948  
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 8,734 11,172  
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 8,734 11,172  
Foreign | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 222,554 194,914  
Foreign | Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Equities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 222,554 194,914  
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 264,131 198,902  
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 264,131 198,902  
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 43,405 40,055  
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 43,405 40,055  
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 34,528 29,996  
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 34,528 29,996  
Foreign | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 45,335 42,143 $ 41,601
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 0 0  
Foreign | Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 45,335 42,143  
Foreign | Real estate | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 45,335 42,143  
Foreign | Diversified growth funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Diversified growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Diversified growth funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 47,621 40,766  
Foreign | Diversified growth funds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 47,621 $ 40,766