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Defined Benefit Plan (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Components of Net Periodic Benefit Cost [Abstract]          
Service cost $ 2,390,000 $ 1,479,000 $ 7,170,000 $ 4,437,000  
Interest cost 2,860,000 2,113,000 8,580,000 6,338,000  
Expected return on assets (4,126,000) (2,310,000) (12,429,000) (6,929,000)  
Unrecognized actuarial loss 1,296,000 1,056,000 3,888,000 3,168,000  
Amortization of prior service cost 39,000 61,000 115,000 184,000  
Net periodic benefit cost 2,459,000 $ 2,399,000 7,324,000 $ 7,198,000  
Plan Assets [Abstract]          
Fair value of plan assets 269,261,000   269,261,000   $ 260,747,000
Employer Contributions [Abstract]          
Estimated employer contributions for the current fiscal year 14,594,000   14,594,000    
Defined Contribution Plan, Employer Discretionary Contribution Amount 9,360,000   9,360,000    
Quoted Prices in Active Markets for Identical Assets          
Plan Assets [Abstract]          
Fair value of plan assets 198,577,000   198,577,000   192,752,000
Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 70,684,000   70,684,000   67,995,000
Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0   0   0
Cash and cash equivalents          
Plan Assets [Abstract]          
Fair value of plan assets 7,921,000   7,921,000   11,801,000
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets          
Plan Assets [Abstract]          
Fair value of plan assets 7,921,000   7,921,000   11,801,000
Cash and cash equivalents | Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0   0   0
Cash and cash equivalents | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0   0   0
Actively Managed | Equity securities (a)          
Plan Assets [Abstract]          
Fair value of plan assets 159,687,000 [1]   159,687,000 [1]   157,050,000 [2]
Actively Managed | Equity securities (a) | Quoted Prices in Active Markets for Identical Assets          
Plan Assets [Abstract]          
Fair value of plan assets 155,850,000 [1]   155,850,000 [1]   149,265,000 [2]
Actively Managed | Equity securities (a) | Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 3,837,000 [1]   3,837,000 [1]   7,785,000 [2]
Actively Managed | Equity securities (a) | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0 [1]   0 [1]   0 [2]
Fixed Income | Fixed income (b)          
Plan Assets [Abstract]          
Fair value of plan assets 101,653,000 [3]   101,653,000 [3]   91,896,000 [4]
Fixed Income | Fixed income (b) | Quoted Prices in Active Markets for Identical Assets          
Plan Assets [Abstract]          
Fair value of plan assets 34,806,000 [3]   34,806,000 [3]   31,686,000 [4]
Fixed Income | Fixed income (b) | Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 66,847,000 [3]   66,847,000 [3]   60,210,000 [4]
Fixed Income | Fixed income (b) | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets $ 0 [3]   $ 0 [3]   $ 0 [4]
[1]
Actively managed portfolio of equity securities with the goal to exceed the benchmark performance
[2]
[3]
Actively managed portfolio of fixed income securities with the goal to exceed the benchmark performance
[4]