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Savings, Pension and Other Postretirement Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Changes in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans
The changes in benefit obligation, plan assets and funded status for company-sponsored benefit plans as of December 31 are as follows:
 
 
Pension Benefit Plans
 
Other Postretirement
Employee Benefit Plans
(In thousands)
 
2017
 
2016
 
2017
 
2016
Benefit obligation at beginning of year
 
$
304,388

 
$
318,444

 
$
69,163

 
$
71,672

Service cost
 
2,069

 
1,562

 
163

 
249

Interest cost
 
13,149

 
14,072

 
2,745

 
3,075

Plan settlements
 
—

 
(10,629
)
 
—

 
—

Actuarial losses (gains)
 
19,130

 
6,225

 
(1,254
)
 
816

Benefits paid
 
(20,922
)
 
(25,286
)
 
(5,689
)
 
(6,649
)
Benefit obligation at end of year
 
317,814

 
304,388

 
65,128

 
69,163

Fair value of plan assets at beginning of year
 
285,638

 
294,076

 
20

 
20

Actual return on plan assets
 
45,796

 
27,056

 
—

 
—

Employer contribution
 
454

 
421

 
5,689

 
6,649

Plan settlements
 
—

 
(10,629
)
 
—

 
—

Benefits paid
 
(20,922
)
 
(25,286
)
 
(5,689
)
 
(6,649
)
Fair value of plan assets at end of year
 
310,966

 
285,638

 
20

 
20

Funded status at end of year
 
$
(6,848
)
 
$
(18,750
)
 
$
(65,108
)
 
$
(69,143
)
Schedule of Amounts Recognized in Balance Sheet
Amounts recognized in the Consolidated Balance Sheets:
 
 
Pension Benefit Plans
 
Other Postretirement
Employee Benefit Plans
(In thousands)
 
2017
 
2016
 
2017
 
2016
Non-current assets
 
$
8,144

 
$
1,740

 
$
—

 
$
—

Current liabilities
 
(441
)
 
(397
)
 
(7,190
)
 
(7,424
)
Non-current liabilities
 
(14,551
)
 
(20,093
)
 
(57,918
)
 
(61,719
)
Net amount recognized
 
$
(6,848
)
 
$
(18,750
)
 
$
(65,108
)
 
$
(69,143
)
Amounts Recognized (Pre-tax) in Accumulated Other Comprehensive Loss
mounts recognized in Accumulated Other Comprehensive Loss as of December 31 consist of:
 
 
Pension Benefit Plans
 
Other Postretirement
Employee Benefit Plans
(In thousands)
 
2017
 
2016
 
2017
 
2016
Net loss (gain)
 
$
99,865

 
$
117,640

 
$
(15,541
)
 
$
(20,906
)
Prior service cost (credit)
 
—

 
8

 
(1,676
)
 
(3,211
)
Net amount recognized
 
$
99,865

 
$
117,648

 
$
(17,217
)
 
$
(24,117
)
Certain Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets
Information as of December 31 for certain pension plans included above with accumulated benefit obligations in excess of plan assets were as follows:
(In thousands)
 
2017
 
2016
Projected benefit obligation
 
$
178,452

 
$
170,716

Accumulated benefit obligation
 
178,452

 
170,716

Fair value of plan assets
 
163,460

 
150,226
Pre-tax Components of Net Periodic Cost
Pre-tax components of net periodic cost and other amounts recognized in Other Comprehensive Income (Loss) for the years ended December 31 were as follows:
Net Periodic Cost:
 
 
Pension Benefit Plans
 
Other Postretirement
Employee Benefit Plans
(In thousands)
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Service cost
 
$
2,069

 
$
1,562

 
$
1,244

 
$
163

 
$
249

 
$
363

Interest cost
 
13,149

 
14,072

 
13,931

 
2,745

 
3,075

 
3,881

Expected return on plan assets
 
(18,765
)
 
(19,389
)
 
(20,117
)
 
(1
)
 
(1
)
 
(1
)
Amortization of prior service cost (credit)
 
8

 
22

 
73

 
(1,535
)
 
(1,712
)
 
(2,178
)
Amortization of actuarial loss (gain)
 
9,874

 
11,463

 
12,619

 
(6,618
)
 
(7,566
)
 
—

Settlement
 
—

 
3,482

 
—

 
—

 
—

 
—

Net periodic cost
 
$
6,335

 
$
11,212

 
$
7,750

 
$
(5,246
)
 
$
(5,955
)
 
$
2,065
Other Amounts Recognized in Other Comprehensive Income (Loss)
Other amounts recognized in Other Comprehensive Income (Loss):
 
 
Pension Benefit Plans
 
Other Postretirement
Employee Benefit Plans
(In thousands)
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Net (gain) loss
 
$
(7,901
)
 
$
(1,445
)
 
$
15,942

 
$
(1,253
)
 
$
818

 
$
(30,700
)
Amortization of prior service (cost) credit
 
(8
)
 
(22
)
 
(73
)
 
1,535

 
1,712

 
2,178

Amortization of actuarial (loss) gain
 
(9,874
)
 
(11,463
)
 
(12,619
)
 
6,618

 
7,566

 
—

Settlement
 
—

 
(3,482
)
 
—

 
—

 
—

 
—

Total recognized in other comprehensive
  (income) loss
 
$
(17,783
)
 
$
(16,412
)
 
$
3,250

 
$
6,900

 
$
10,096

 
$
(28,522
)
Total recognized in net periodic cost and
  other comprehensive (income) loss
 
$
(11,448
)
 
$
(5,200
)
 
$
11,000

 
$
1,654

 
$
4,141

 
$
(26,457
)
Weighted Average Assumptions Used to Determine Benefit Obligation
Weighted average assumptions used to determine the benefit obligation as of December 31 were:
 
 
Pension Benefit Plans
 
Other Postretirement
Employee Benefit Plans
 
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Discount rate
 
3.90
%
 
4.45
%
 
4.70
%
 
3.95
%
 
4.30
%
 
4.50
%
Weighted average assumptions used to determine the net periodic cost for the years ended December 31 were:
 
 
Pension Benefit Plans
 
Other Postretirement
Employee Benefit Plans
  
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Discount rate
 
4.45
%
 
4.70
%
 
4.25
%
 
4.30
%
 
4.50
%
 
4.15
%
Expected return on plan assets
 
6.75

 
6.75

 
7.00

 
—

 
—

 
—
One Percentage Point Change in Health Care Cost Trend Rates
A one percentage point change in the health care cost trend rates would have the following effects:
(In thousands)
 
1% Increase

 
1% Decrease

Effect on total of service and interest cost components
 
$
193

 
$
(168
)
Effect on postretirement employee benefit obligation
 
4,150

 
(3,614
)
Investments at Fair Value for Company Sponsored Pension Benefit Plans within Fair Value Hierarchy
The following tables set forth by level, within the fair value hierarchy, the investments at fair value for our company-sponsored pension benefit plans:
 
 
December 31, 2017
(In thousands)
 
Level 1
 
Investments measured at net asset value
 
Total
Cash and cash equivalents
 
$
2,010

 
$
—

 
$
2,010

Common and collective trust:
 
 
 
 
 
 
Collective investment funds
 
—

 
308,956

 
308,956

Total investments at fair value
 
$
2,010

 
$
308,956

 
$
310,966

 
 
December 31, 2016
(In thousands)
 
Level 1
 
Investments measured at net asset value
 
Total
Cash and cash equivalents
 
$
2,002

 
$
—

 
$
2,002

Common and collective trusts:
 
 
 
 
 
 
Collective investment funds
 
—

 
283,636

 
283,636

Total investments at fair value
 
$
2,002

 
$
283,636

 
$
285,638
Long Term Asset Allocation Ranges
Assets are diversified among various asset classes, such as domestic equities, international equities, fixed income and cash. The long-term asset allocation ranges are as follows:
Domestic equities
  
 
14%-22%
  
International equities, including emerging markets
  
 
13%-22%
  
Corporate bonds
  
 
50%-70%
  
Liquid reserves
  
 
0%-5%
  
Schedule of Expected Benefit Payments
Estimated future benefit payments are as follows for the years indicated:
(In thousands)
 
Pension Benefit Plans
 
Other
Postretirement
Employee
Benefit Plans
2018
 
20,210

 
7,210

2019
 
20,372

 
6,700

2020
 
20,338

 
6,224

2021
 
20,278

 
5,182

2022
 
20,257

 
4,639

2023-2027
 
99,994

 
18,702
Multiemployer Defined Benefit Plans
Pension
Fund
 
EIN
 
Plan
Number
 
PPA Zone Status1    
 
FIP/RP Status Pending/
Implemented
 
Contributions
(in thousands)
 
Surcharge
Imposed
 
Expiration
 Date
of Collective
Bargaining
Agreement
2017
 
2016
 
2017
 
2016
 
2015
 
IAM NPF
 
51-6031295
 
002
 
Green
 
Green
 
N/A
 
$
333

 
$
335

 
$
329

 
No
 
5/31/2018
PIUMPF
 
11-6166763
 
001
 
Red
 
Red
 
Implemented
 
5,815

 
5,679

 
5,631

 
No
 
8/31/2017
 
 
 
 
 
 
 
 
 
Total Contributions:
 
$
6,148

 
$
6,014

 
$
5,960

 
 
 
 

1  
PIUMPF has been certified as in "Critical and Declining Status" for 2017 and 2016, under the provisions of the Multiemployer Pension Plan Reform Act of 2014.