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Pension and Postretirement Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Defined Benefit Pension Plan [Member]  
Schedule of Net Benefit Costs
Defined Benefit Plans. The total benefit arising from the Company’s defined benefit pension plans consists of the following components:
  
Three Months Ended September 30
 
Nine Months Ended September 30
(in thousands)
2018
 
2017
 
2018
 
2017
Service cost
$
4,473

 
$
4,591

 
$
13,730

 
$
14,096

Interest cost
11,844

 
11,980

 
34,943

 
35,945

Expected return on assets
(31,969
)
 
(30,338
)
 
(97,251
)
 
(91,078
)
Amortization of prior service cost
36

 
42

 
114

 
128

Recognized actuarial gain
(2,974
)
 
(1,039
)
 
(6,994
)
 
(3,372
)
Net Periodic Benefit
(18,590
)
 
(14,764
)
 
(55,458
)
 
(44,281
)
Curtailment gain
—

 
—

 
(806
)
 
—

Special separation benefit expense
—

 
932

 
—

 
932

Total Benefit
$
(18,590
)
 
$
(13,832
)
 
$
(56,264
)
 
$
(43,349
)
Schedule of Allocation of Plan Assets
The assets of the Company’s pension plan were allocated as follows:
  
As of
  
September 30,
2018
 
December 31,
2017
  
 
U.S. equities
52
%
 
53
%
U.S. stock index fund
31
%
 
30
%
U.S. fixed income
11
%
 
11
%
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 September 30
 
Nine Months Ended September 30
(in thousands)
2018
 
2017
 
2018
 
2017
Service cost
$
205

 
$
214

 
$
614

 
$
643

Interest cost
967

 
1,059

 
2,899

 
3,175

Amortization of prior service cost
77

 
114

 
233

 
342

Recognized actuarial loss
600

 
444

 
1,802

 
1,331

Net Periodic Cost
$
1,849

 
$
1,831

 
$
5,548

 
$
5,491
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 September 30
 
Nine Months Ended September 30
(in thousands)
2018
 
2017
 
2018
 
2017
Service cost
$
267

 
$
257

 
$
803

 
$
771

Interest cost
170

 
195

 
509

 
584

Amortization of prior service credit
(44
)
 
(38
)
 
(132
)
 
(112
)
Recognized actuarial gain
(921
)
 
(972
)
 
(2,764
)
 
(2,917
)
Net Periodic Benefit
$
(528
)
 
$
(558
)
 
$
(1,584
)
 
$
(1,674
)