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Pension and Other Post-Retirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of funded status and amounts recognized for defined benefit pension and other post-retirement benefit plans
The following table sets forth the defined benefit pension and other post-retirement benefit plans’ funded status and amounts recognized for those plans in the Company’s Consolidated Balance Sheets. 
 
 
For the Years Ended December 31,
 
 
2016
 
2015
 
2016
 
2015
 
 
Pension Benefits
 
Other Benefits
 
 
(Thousands)
Change in benefit obligation:
 
 

 
 

 
 

 
 

Benefit obligation at beginning of year
 
$
23,045

 
$
21,704

 
$
17,635

 
$
18,741

Service cost
 
175

 
350

 
764

 
762

Interest cost
 
242

 
746

 
663

 
634

Actuarial (gain) loss
 
(366
)
 
2,770

 
(659
)
 
(361
)
Benefits paid
 
(1,600
)
 
(1,981
)
 
(2,217
)
 
(2,141
)
Expenses paid
 
(226
)
 
(367
)
 
—

 
—

Settlements
 
(21,270
)
 
(177
)
 
—

 
—

Benefit obligation at end of year
 
$
—

 
$
23,045

 
$
16,186

 
$
17,635

 
 
 
 
 
 
 
 
 
Change in plan assets:
 
 

 
 

 
 

 
 

Fair value of plan assets at beginning of year
 
$
16,941

 
$
18,323

 
$
1,110

 
$
823

Actual gain (loss) on plan assets
 
776

 
(32
)
 
—

 
—

Contributions
 
5,379

 
1,175

 
494

 
287

Benefits paid
 
(1,600
)
 
(1,981
)
 
—

 
—

Expenses paid
 
(226
)
 
(367
)
 
—

 
—

Settlements
 
(21,270
)
 
(177
)
 
—

 
—

Fair value of plan assets at end of year
 
—

 
16,941

 
1,604

 
1,110

Funded status at end of year
 
$
—

 
$
(6,104
)
 
$
(14,582
)
 
$
(16,525
)
Schedule of amounts recognized in statement of financial position
Amounts recognized in the statement of financial position consist of:
 
 

 
 

 
 

 
 

Current liabilities
 
$
—

 
$
(6,104
)
 
$
(1,383
)
 
$
(1,376
)
Noncurrent liabilities
 
—

 
—

 
(13,199
)
 
(15,149
)
Net amounts recognized
 
$
—

 
$
(6,104
)
 
$
(14,582
)
 
$
(16,525
)
Amounts recognized in accumulated OCI, net of tax, consist of:
 
 

 
 

 
 

 
 

Net loss
 
$
—

 
$
9,674

 
$
6,636

 
$
7,610

Net prior service
 
—

 
—

 
230

 
257

Net amount recognized
 
$
—

 
$
9,674

 
$
6,866

 
$
7,867
Schedule of components of net periodic benefit cost
The Company’s costs related to its defined benefit pension and other post-retirement benefit plans were as follows:
 
 
For the Years Ended December 31,
 
 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
 
 
Pension Benefits
 
Other Benefits
 
 
(Thousands)
Components of net periodic benefit cost:
 
 

 
 

 
 

 
 

 
 

 
 

Service cost
 
$
175

 
$
350

 
$
350

 
$
764

 
$
762

 
$
669

Interest cost
 
242

 
746

 
820

 
663

 
634

 
693

Expected return on plan assets
 
(287
)
 
(627
)
 
(1,377
)
 
—

 
—

 
—

Amortization of prior service cost
 
—

 
—

 
—

 
(306
)
 
(306
)
 
(446
)
Recognized net actuarial loss
 
423

 
746

 
709

 
703

 
793

 
879

Settlement loss and special termination benefits
 
14,685

 
122

 
879

 
—

 
—

 
—

Net periodic benefit cost
 
$
15,238

 
$
1,337

 
$
1,381

 
$
1,824

 
$
1,883

 
$
1,795
Schedule of amount recognized in other comprehensive income
Currently, the Company recognizes expense for on-going post-retirement benefits other than pensions, a portion of which expense is subject to recovery in the approved rates of EQM's rate-regulated business.
 
 
For the Years Ended December 31,
 
 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
 
 
Pension Benefits
 
Other Benefits
 
 
(Thousands)
Other changes in plan assets and benefit obligations recognized in OCI, net of tax:
 
 

 
 

 
 

 
 

 
 

 
 

Net loss (gain)
 
$
(9,674
)
 
$
1,592

 
$
558

 
$
(974
)
 
$
(663
)
 
$
39

Net prior service (credit) cost
 
—

 
—

 
—

 
(27
)
 
(28
)
 
179

Total recognized in OCI, net of tax
 
$
(9,674
)
 
$
1,592

 
$
558

 
$
(1,001
)
 
$
(691
)
 
$
218

Total recognized in net periodic benefit cost and OCI, net of tax
 
$
5,564

 
$
2,929

 
$
1,939

 
$
823

 
$
1,192

 
$
2,013
Schedule of weighted average assumption used to determine the benefit obligations
The following weighted average assumptions were used to determine the benefit obligations for the Company’s defined benefit pension and other post-retirement benefit plans:
 
 
December 31,
 
 
2016
 
2015
 
2016
 
2015
 
 
Pension Benefits
 
Other Benefits
Discount rate
 
N/A
 
2.20%
 
3.80%
 
3.95%
Rate of compensation increase
 
N/A
 
N/A
 
N/A
 
N/A
Schedule of weighted average assumption used to determine the net periodic benefit cost
The following weighted average assumptions were used to determine the net periodic benefit cost for the Company’s defined benefit pension and other post-retirement benefit plans:
 
 
For the Years Ended December 31,
 
 
2016
 
2015
 
2016
 
2015
 
 
Pension Benefits
 
Other Benefits
Discount rate
 
2.20%
 
3.60%
 
3.95%
 
3.60%
Expected return on plan assets
 
3.75%
 
3.75%
 
N/A
 
N/A
Rate of compensation increase
 
N/A
 
N/A
 
N/A
 
N/A
Schedule of impact of one-percentage-point change in assumed health care cost trend rates
A one-percentage-point change in assumed health care cost trend rates would have had the following effects:
 
 
One-Percentage-Point
Increase
 
One-Percentage-Point
Decrease
 
 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
 
 
(Thousands)
Increase (decrease) to total of service and interest cost components
 
$
16

 
$
10

 
$
13

 
$
(18
)
 
$
(11
)
 
$
(14
)
Increase (decrease) to post-retirement benefit obligation
 
$
181

 
$
268

 
$
228

 
$
(190
)
 
$
(278
)
 
$
(229
)