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Pension and Postretirement Plans (Tables)
 6 Months Ended
Jun. 30, 2019
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 June 30
 
Six Months Ended June 30
(in thousands)
2019
 
2018
 
2019
 
2018
Service cost
$
4,963

 
$
4,317

 
$
10,184

 
$
9,257

Interest cost
11,743

 
11,844

 
23,335

 
23,099

Expected return on assets
(30,285
)
 
(32,796
)
 
(61,123
)
 
(65,282
)
Amortization of prior service cost
825

 
36

 
1,234

 
78

Recognized actuarial loss (gain)
37

 
(2,974
)
 
—

 
(4,020
)
Net Periodic Benefit
(12,717
)
 
(19,573
)
 
(26,370
)
 
(36,868
)
Curtailment gain
—

 
—

 
—

 
(806
)
Special separation benefit expense
6,607

 
—

 
6,607

 
—

Total Benefit
$
(6,110
)
 
$
(19,573
)
 
$
(19,763
)
 
$
(37,674
)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plan were allocated as follows:
  
As of
  
June 30,
2019
 
December 31,
2018
  
 
U.S. equities
55
%
 
53
%
U.S. stock index fund
26
%
 
28
%
U.S. fixed income
13
%
 
13
%
International equities
6
%
 
6
%
  
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 June 30
 
Six Months Ended June 30
(in thousands)
2019
 
2018
 
2019
 
2018
Service cost
$
215

 
$
204

 
$
429

 
$
409

Interest cost
1,079

 
966

 
2,157

 
1,932

Amortization of prior service cost
84

 
78

 
169

 
156

Recognized actuarial loss
578

 
601

 
1,157

 
1,202

Net Periodic Cost
$
1,956

 
$
1,849

 
$
3,912

 
$
3,699
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 June 30
 
Six Months Ended June 30
(in thousands)
2019
 
2018
 
2019
 
2018
Service cost
$
—

 
$
268

 
$
—

 
$
536

Interest cost
72

 
169

 
144

 
339

Amortization of prior service credit
(1,840
)
 
(44
)
 
(3,681
)
 
(88
)
Recognized actuarial gain
(1,090
)
 
(921
)
 
(2,180
)
 
(1,843
)
Net Periodic Benefit
$
(2,858
)
 
$
(528
)
 
$
(5,717
)
 
$
(1,056
)