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Pension and Postretirement Plans (Tables)
 9 Months Ended
Sep. 30, 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 September 30
 
Nine Months Ended September 30
(in thousands)
2017
 
2016
 
2017
 
2016
Service cost
$
4,591

 
$
5,040

 
$
14,096

 
$
15,422

Interest cost
11,980

 
12,845

 
35,945

 
38,763

Expected return on assets
(30,338
)
 
(30,348
)
 
(91,078
)
 
(91,122
)
Amortization of prior service cost
42

 
74

 
128

 
223

Recognized actuarial gain
(1,039
)
 
—

 
(3,372
)
 
—

Net Periodic Benefit
(14,764
)
 
(12,389
)
 
(44,281
)
 
(36,714
)
Special separation benefit expense
932

 
—

 
932

 
—

Total Benefit
$
(13,832
)
 
$
(12,389
)
 
$
(43,349
)
 
$
(36,714
)
Schedule of Allocation of Plan Assets
The assets of the Company’s pension plan were allocated as follows:
  
As of
  
September 30,
2017
 
December 31,
2016
  
 
U.S. equities
51
%
 
53
%
U.S. stock index fund
32
%
 
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)
2017
 
2016
 
2017
 
2016
Service cost
$
214

 
$
246

 
$
643

 
$
738

Interest cost
1,059

 
1,096

 
3,175

 
3,288

Amortization of prior service cost
114

 
114

 
342

 
342

Recognized actuarial loss
444

 
665

 
1,331

 
1,995

Net Periodic Cost
$
1,831

 
$
2,121

 
$
5,491

 
$
6,363
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)
2017
 
2016
 
2017
 
2016
Service cost
$
257

 
$
346

 
$
771

 
$
1,039

Interest cost
195

 
308

 
584

 
923

Amortization of prior service credit
(38
)
 
(83
)
 
(112
)
 
(251
)
Recognized actuarial gain
(972
)
 
(376
)
 
(2,917
)
 
(1,127
)
Net Periodic (Benefit) Cost
$
(558
)
 
$
195

 
$
(1,674
)
 
$
584