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Pension and Postretirement Plans (Tables)
 9 Months Ended
Sep. 30, 2016
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, including a portion included in discontinued operations, consists of the following components:
  
Three Months Ended September 30
 
Nine Months Ended September 30
(in thousands)
2016
 
2015
 
2016
 
2015
Service cost
$
5,040

 
$
6,090

 
$
15,422

 
$
20,593

Interest cost
12,845

 
13,516

 
38,763

 
39,077

Expected return on assets
(30,348
)
 
(33,673
)
 
(91,122
)
 
(96,771
)
Amortization of prior service cost
74

 
79

 
223

 
241

Recognized actuarial gain
—

 
(6,057
)
 
—

 
(6,057
)
Net Periodic Benefit
(12,389
)
 
(20,045
)
 
(36,714
)
 
(42,917
)
Curtailment gains
—

 
(3,267
)
 
—

 
(3,267
)
Early retirement programs and special separation benefit expense
—

 
3,734

 
—

 
3,734

Total Benefit
$
(12,389
)
 
$
(19,578
)
 
$
(36,714
)
 
$
(42,450
)
Schedule of Allocation of Plan Assets
The assets of the Company’s pension plan were allocated as follows:
  
As of
  
September 30,
2016
 
December 31,
2015
  
 
U.S. equities
78
%
 
62
%
U.S. fixed income
15
%
 
13
%
International equities
7
%
 
25
%
  
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), including a portion included in discontinued operations, consists of the following components:
  
Three Months Ended September 30
 
Nine Months Ended September 30
(in thousands)
2016
 
2015
 
2016
 
2015
Service cost
$
246

 
$
464

 
$
738

 
$
1,482

Interest cost
1,096

 
1,140

 
3,288

 
3,410

Amortization of prior service cost
114

 
115

 
342

 
343

Recognized actuarial loss
665

 
630

 
1,995

 
2,385

Net Periodic Cost
$
2,121

 
$
2,349

 
$
6,363

 
$
7,620
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)
2016
 
2015
 
2016
 
2015
Service cost
$
346

 
$
333

 
$
1,039

 
$
999

Interest cost
308

 
325

 
923

 
974

Amortization of prior service credit
(83
)
 
(126
)
 
(251
)
 
(377
)
Recognized actuarial gain
(376
)
 
(249
)
 
(1,127
)
 
(747
)
Net Periodic Cost
$
195

 
$
283

 
$
584

 
$
849