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Pension Plan and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Pension Plan and Other Postretirement Benefits
Pension Plan and Other Postretirement Benefits
 
The Company provides a qualified, defined-benefit, non-contributory pension plan for substantially all employees. The Company makes annual contributions to fund the amounts accrued for in the qualified pension plan. The Company also maintains an unfunded, non-qualified, supplemental executive retirement plan. The costs of the plans are charged to expense or are capitalized in utility plant as appropriate.
 
The Company offers medical, dental, vision, and life insurance benefits for retirees and their spouses and dependents. Participants are required to pay a premium, which offsets a portion of the cost.
 
Cash contributions by the Company related to pension plans were $14.0 million and $14.1 million for the six months ended June 30, 2016 and June 30, 2015, respectively. Cash contributions by the Company related to other postretirement benefit plans were $3.3 million and $3.7 million for the six months ended June 30, 2016 and June 30, 2015, respectively. The 2016 estimated cash contribution to the pension plans is $27.3 million and to the other postretirement benefit plans is $13.4 million.
 
The following table lists components of net periodic benefit costs for the pension plans and other postretirement benefits. The data listed under “pension plan” includes the qualified pension plan and the non-qualified supplemental executive retirement plan. The data listed under “other benefits” is for all other postretirement benefits.
 
 
Three Months Ended June 30
 
Pension Plan
 
Other Benefits
 
2016
 
2015
 
2016
 
2015
Service cost
$
5,067

 
$
5,632

 
$
2,304

 
$
2,500

Interest cost
5,453

 
5,003

 
1,800

 
1,614

Expected return on plan assets
(5,454
)
 
(4,792
)
 
(1,046
)
 
(876
)
Amortization of prior service cost
1,555

 
1,502

 
11

 
11

Recognized net actuarial loss
1,293

 
2,400

 
1,261

 
1,458

Net periodic benefit cost
$
7,914

 
$
9,745

 
$
4,330

 
$
4,707

 
 
Six Months Ended June 30
 
Pension Plan
 
Other Benefits
 
2016
 
2015
 
2016
 
2015
Service cost
$
10,134

 
$
11,265

 
$
4,608

 
$
5,001

Interest cost
10,906

 
10,006

 
3,600

 
3,227

Expected return on plan assets
(10,908
)
 
(9,584
)
 
(2,092
)
 
(1,752
)
Amortization of prior service cost
3,109

 
3,004

 
22

 
22

Recognized net actuarial loss
2,586

 
4,800

 
2,523

 
2,917

Net periodic benefit cost
$
15,827

 
$
19,491

 
$
8,661

 
$
9,415