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Pension and Postretirement Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31
(in thousands)
2018
 
2017
Service cost
$
4,940

 
$
4,914

Interest cost
11,255

 
11,986

Expected return on assets
(32,486
)
 
(30,337
)
Amortization of prior service cost
42

 
43

Recognized actuarial gain
(1,046
)
 
(1,294
)
Net Periodic Benefit
(17,295
)
 
(14,688
)
Curtailment gain
(806
)
 
—

Total Benefit
$
(18,101
)
 
$
(14,688
)
Schedule of Allocation of Plan Assets
The assets of the Company’s pension plan were allocated as follows:
  
As of
  
March 31,
2018
 
December 31,
2017
  
 
U.S. equities
49
%
 
53
%
U.S. stock index fund
30
%
 
30
%
U.S. fixed income
12
%
 
11
%
International equities
9
%
 
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 March 31
(in thousands)
2018
 
2017
Service cost
$
205

 
$
214

Interest cost
966

 
1,058

Amortization of prior service cost
78

 
114

Recognized actuarial loss
601

 
444

Net Periodic Cost
$
1,850

 
$
1,830
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)
2018
 
2017
Service cost
$
268

 
$
257

Interest cost
170

 
195

Amortization of prior service credit
(44
)
 
(37
)
Recognized actuarial gain
(922
)
 
(973
)
Net Periodic Benefit
$
(528
)
 
$
(558
)