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Employee Benefits
 9 Months Ended
Sep. 30, 2019
Retirement Benefits, Description [Abstract]  
Employee Benefits Employee Benefits
The expected return on plan assets is included in "Investment and interest income, net" in the Company's Statements of Operations. The amortization of prior service benefit and amortization of gains are included in "Miscellaneous non-operating income". The amortization of prior service cost and amortization of losses are included in "Miscellaneous non-operating deductions". The interest cost component of net periodic benefit cost is included in "Other interest".
Retirement Plans
The net periodic benefit cost recognized for the three, nine and twelve months ended September 30, 2019 and 2018, is made up of the components listed below as determined using the projected unit credit actuarial cost method (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
Twelve Months Ended
 
September 30,
 
September 30,
 
September 30,
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
2,476

 
$
2,801

 
$
7,429

 
$
8,316

 
$
10,201

 
$
10,446

Interest cost
3,614

 
3,214

 
10,841

 
9,659

 
14,060

 
12,924

Expected return on plan assets
(5,373
)
 
(5,176
)
 
(16,119
)
 
(15,806
)
 
(21,389
)
 
(20,603
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Net loss
1,449

 
2,214

 
4,345

 
6,414

 
6,484

 
8,527

Prior service benefit
(877
)
 
(875
)
 
(2,630
)
 
(2,630
)
 
(3,506
)
 
(3,506
)
Net periodic benefit cost
$
1,289

 
$
2,178

 
$
3,866

 
$
5,953

 
$
5,850

 
$
7,788


During the nine months ended September 30, 2019, the Company contributed $8.8 million of its projected $9.5 million 2019 annual contribution to its retirement plans.
Other Postretirement Benefits
The net periodic benefit recognized for the three, nine and twelve months ended September 30, 2019 and 2018, is made up of the components listed below (in thousands): 
 
Three Months Ended
 
Nine Months Ended
 
Twelve Months Ended
 
September 30,
 
September 30,
 
September 30,
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
606

 
$
696

 
$
1,817

 
$
2,096

 
$
2,516

 
$
2,655

Interest cost
614

 
559

 
1,842

 
1,689

 
2,405

 
2,370

Expected return on plan assets
(530
)
 
(602
)
 
(1,590
)
 
(1,827
)
 
(2,198
)
 
(2,304
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service benefit
(1,308
)
 
(1,538
)
 
(3,925
)
 
(4,613
)
 
(5,463
)
 
(6,151
)
Net gain
(595
)
 
(574
)
 
(1,783
)
 
(1,624
)
 
(2,325
)
 
(2,044
)
Net periodic benefit
$
(1,213
)
 
$
(1,459
)
 
$
(3,639
)
 
$
(4,279
)
 
$
(5,065
)
 
$
(5,474
)

During the nine months ended September 30, 2019, the Company contributed $0.5 million of its projected $0.6 million 2019 annual contribution to its other postretirement benefits plan.