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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Change in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans and Obligations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amounts recognized in the consolidated balance sheets [Abstract]      
Noncurrent liabilities $ (115,463) $ (110,659)  
Pension Plans [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year (427,909) (392,371)  
Service cost (7,767) (8,454) $ (6,753)
Interest cost (18,465) (16,992) (16,096)
Actuarial (loss) gain (53,446) 20,445  
Benefits paid 33,350 31,530  
Plan acquisitions   (62,067)  
Benefit obligation at end of year (474,237) (427,909) (392,371)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 351,285 313,862  
Actual return (loss) on plan assets 78,448 (23,745)  
Employer contributions and benefit payments 2,085 53,998  
Benefits paid (33,350) (31,530)  
Plan acquisitions   38,700  
Fair value of plan assets at end of year 398,468 351,285 313,862
Amounts recognized in the consolidated balance sheets [Abstract]      
Current liabilities (2,152) (2,121)  
Noncurrent liabilities (73,617) (74,503)  
Funded status (75,769) (76,624)  
OPEB [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year (40,032) (30,349)  
Service cost (371) (341) (14)
Interest cost (1,588) (1,482) (1,262)
Actuarial (loss) gain (7,997) 2,100  
Benefits paid 3,593 3,582  
Plan acquisitions   (13,542)  
Benefit obligation at end of year (46,395) (40,032) $ (30,349)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Employer contributions and benefit payments 3,593 3,582  
Benefits paid (3,593) (3,582)  
Amounts recognized in the consolidated balance sheets [Abstract]      
Current liabilities (4,549) (3,876)  
Noncurrent liabilities (41,846) (36,156)  
Funded status $ (46,395) $ (40,032)