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Pension and Postretirement Plans (Tables)
 6 Months Ended
Jun. 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 June 30
 
Six Months Ended June 30
(in thousands)
2017
 
2016
 
2017
 
2016
Service cost
$
4,591

 
$
5,040

 
$
9,505

 
$
10,382

Interest cost
11,979

 
12,845

 
23,965

 
25,918

Expected return on assets
(30,403
)
 
(30,226
)
 
(60,740
)
 
(60,774
)
Amortization of prior service cost
43

 
75

 
86

 
149

Recognized actuarial gain
(1,039
)
 
—

 
(2,333
)
 
—

Net Periodic Benefit
$
(14,829
)
 
$
(12,266
)
 
$
(29,517
)
 
$
(24,325
)
Schedule of Allocation of Plan Assets
The assets of the Company’s pension plan were allocated as follows:
  
As of
  
June 30,
2017
 
December 31,
2016
  
 
U.S. equities
52
%
 
53
%
U.S. stock index fund
31
%
 
30
%
U.S. fixed income
10
%
 
11
%
International equities
7
%
 
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)
2017
 
2016
 
2017
 
2016
Service cost
$
215

 
$
246

 
$
429

 
$
492

Interest cost
1,058

 
1,096

 
2,116

 
2,192

Amortization of prior service cost
114

 
114

 
228

 
228

Recognized actuarial loss
443

 
665

 
887

 
1,330

Net Periodic Cost
$
1,830

 
$
2,121

 
$
3,660

 
$
4,242
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)
2017
 
2016
 
2017
 
2016
Service cost
$
257

 
$
347

 
$
514

 
$
693

Interest cost
194

 
307

 
389

 
615

Amortization of prior service credit
(37
)
 
(84
)
 
(74
)
 
(168
)
Recognized actuarial gain
(972
)
 
(376
)
 
(1,945
)
 
(751
)
Net Periodic (Benefit) Cost
$
(558
)
 
$
194

 
$
(1,116
)
 
$
389