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Employee Benefits
 6 Months Ended
Jun. 30, 2017
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Employee Benefits
Employee Benefits
Retirement Plans
The net periodic benefit cost recognized for the three, six and twelve months ended June 30, 2017 and 2016 is made up of the components listed below as determined using the projected unit credit actuarial cost method (in thousands):
 
Three Months Ended
 
Six Months Ended
 
Twelve Months Ended
 
June 30,
 
June 30,
 
June 30,
 
2017
 
2016
 
2017

2016
 
2017
 
2016
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
1,989

 
$
1,905

 
$
4,259

 
$
3,810

 
$
8,450

 
$
8,402

Interest cost
3,282

 
3,265

 
6,530

 
6,530

 
13,039

 
13,775

Expected return on plan assets
(4,787
)
 
(4,713
)
 
(9,595
)
 
(9,425
)
 
(19,049
)
 
(19,325
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Net loss
2,138

 
1,887

 
4,227

 
3,775

 
7,791

 
8,922

Prior service benefit
(875
)
 
(877
)
 
(1,753
)
 
(1,755
)
 
(3,504
)
 
(3,486
)
Net periodic benefit cost
$
1,747

 
$
1,467

 
$
3,668

 
$
2,935

 
$
6,727

 
$
8,288


During the six months ended June 30, 2017, the Company contributed $6.5 million of its projected $10.0 million 2017 annual contribution to its retirement plans.
Other Postretirement Benefits
The net periodic benefit recognized for the three, six and twelve months ended June 30, 2017 and 2016 is made up of the components listed below (in thousands): 
 
Three Months Ended
 
Six Months Ended
 
Twelve Months Ended
 
June 30,
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Components of net periodic benefit:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
530

 
$
715

 
$
1,118

 
$
1,430

 
$
2,457

 
$
3,134

Interest cost
684

 
872

 
1,362

 
1,745

 
2,784

 
3,730

Expected return on plan assets
(483
)
 
(460
)
 
(953
)
 
(920
)
 
(1,868
)
 
(1,940
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service benefit
(1,538
)
 
(787
)
 
(3,076
)
 
(1,575
)
 
(5,402
)
 
(3,093
)
Net gain
(444
)
 
(665
)
 
(839
)
 
(1,330
)
 
(1,883
)
 
(2,355
)
Net periodic benefit
$
(1,251
)
 
$
(325
)
 
$
(2,388
)
 
$
(650
)
 
$
(3,912
)
 
$
(524
)

During the six months ended June 30, 2017, the Company contributed $0.2 million of its projected $2.4 million 2017 annual contribution to its other postretirement benefits plan.