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Pension and Postretirement Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Defined Benefit Pension Plan [Member]  
Schedule of Net Benefit Costs The total benefit arising from the Company’s defined benefit pension plans consists of the following components:
  
Three Months Ended 
 March 31
(in thousands)
2020
 
2019
Service cost
$
5,783

 
$
5,221

Interest cost
8,169

 
11,592

Expected return on assets
(28,444
)
 
(30,838
)
Amortization of prior service cost
708

 
409

Recognized actuarial gain
—

 
(37
)
Net Periodic Benefit
$
(13,784
)
 
$
(13,653
)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plan were allocated as follows:
  
As of
  
March 31,
2020
 
December 31,
2019
  
 
U.S. equities
61
%
 
62
%
Private investment fund
13
%
 
7
%
U.S. fixed income
10
%
 
10
%
U.S. stock index fund
9
%
 
14
%
International equities
7
%
 
7
%
  
100
%
 
100
%
Supplemental Executive Retirement Plan (SERP) [Member]  
Schedule of Net Benefit Costs
The total cost arising from the Company’s Supplemental Executive Retirement Plan (SERP) consists of the following components:
  
Three Months Ended 
 March 31
(in thousands)
2020
 
2019
Service cost
$
238

 
$
214

Interest cost
919

 
1,078

Amortization of prior service cost
83

 
85

Recognized actuarial loss
1,317

 
579

Net Periodic Cost
$
2,557

 
$
1,956
Other Postretirement Benefit Plan, Defined Benefit [Member]  
Schedule of Net Benefit Costs
Other Postretirement Plans. The total cost arising from the Company’s other postretirement plans consists of the following components:
  
Three Months Ended 
 March 31
(in thousands)
2020
 
2019
Interest cost
$
62

 
$
72

Amortization of prior service credit
(120
)
 
(1,841
)
Recognized actuarial gain
(1,097
)
 
(1,090
)
Net Periodic Benefit
$
(1,155
)
 
$
(2,859
)