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Pension and Postretirement Plans (Tables)
 6 Months Ended
Jun. 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 June 30
 
Six Months Ended June 30
(in thousands)
2018
 
2017
 
2018
 
2017
Service cost
$
4,317

 
$
4,591

 
$
9,257

 
$
9,505

Interest cost
11,844

 
11,979

 
23,099

 
23,965

Expected return on assets
(32,796
)
 
(30,403
)
 
(65,282
)
 
(60,740
)
Amortization of prior service cost
36

 
43

 
78

 
86

Recognized actuarial gain
(2,974
)
 
(1,039
)
 
(4,020
)
 
(2,333
)
Net Periodic Benefit
(19,573
)
 
(14,829
)
 
(36,868
)
 
(29,517
)
Curtailment gain
—

 
—

 
(806
)
 
—

Total Benefit
$
(19,573
)
 
$
(14,829
)
 
$
(37,674
)
 
$
(29,517
)
Schedule of Allocation of Plan Assets
The assets of the Company’s pension plan were allocated as follows:
  
As of
  
June 30,
2018
 
December 31,
2017
  
 
U.S. equities
49
%
 
53
%
U.S. stock index fund
31
%
 
30
%
U.S. fixed income
11
%
 
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 June 30
 
Six Months Ended June 30
(in thousands)
2018
 
2017
 
2018
 
2017
Service cost
$
204

 
$
215

 
$
409

 
$
429

Interest cost
966

 
1,058

 
1,932

 
2,116

Amortization of prior service cost
78

 
114

 
156

 
228

Recognized actuarial loss
601

 
443

 
1,202

 
887

Net Periodic Cost
$
1,849

 
$
1,830

 
$
3,699

 
$
3,660
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)
2018
 
2017
 
2018
 
2017
Service cost
$
268

 
$
257

 
$
536

 
$
514

Interest cost
169

 
194

 
339

 
389

Amortization of prior service credit
(44
)
 
(37
)
 
(88
)
 
(74
)
Recognized actuarial gain
(921
)
 
(972
)
 
(1,843
)
 
(1,945
)
Net Periodic Benefit
$
(528
)
 
$
(558
)
 
$
(1,056
)
 
$
(1,116
)