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Pension and Postretirement Plans (Tables)
 3 Months Ended
Mar. 31, 2017
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)
2017
 
2016
Service cost
$
4,914

 
$
5,342

Interest cost
11,986

 
13,073

Expected return on assets
(30,337
)
 
(30,548
)
Amortization of prior service cost
43

 
74

Recognized actuarial gain
(1,294
)
 
—

Net Periodic Benefit
$
(14,688
)
 
$
(12,059
)
Schedule of Allocation of Plan Assets
The assets of the Company’s pension plan were allocated as follows:
  
As of
  
March 31,
2017
 
December 31,
2016
  
 
U.S. equities
50
%
 
53
%
U.S. stock index fund
31
%
 
30
%
U.S. fixed income
13
%
 
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 March 31
(in thousands)
2017
 
2016
Service cost
$
214

 
$
246

Interest cost
1,058

 
1,096

Amortization of prior service cost
114

 
114

Recognized actuarial loss
444

 
665

Net Periodic Cost
$
1,830

 
$
2,121
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)
2017
 
2016
Service cost
$
257

 
$
346

Interest cost
195

 
308

Amortization of prior service credit
(37
)
 
(84
)
Recognized actuarial gain
(973
)
 
(375
)
Net Periodic (Benefit) Cost
$
(558
)
 
$
195