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Employee Benefits
 9 Months Ended
Sep. 30, 2012
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Employee Benefits
Employee Benefits
Retirement Plans
The net periodic benefit cost recognized for the three, nine and twelve months ended September 30, 2012 and 2011 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,
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
2,207

 
$
1,712

 
$
6,621

 
$
5,137

 
$
8,334

 
$
6,653

Interest cost
3,389

 
3,497

 
10,167

 
10,491

 
13,663

 
13,898

Amendments
—

 
—

 
—

 
—

 
—

 
838

Expected return on plan assets
(3,611
)
 
(3,523
)
 
(10,832
)
 
(10,571
)
 
(14,356
)
 
(14,038
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Net loss
2,839

 
1,636

 
8,517

 
4,908

 
10,153

 
5,796

Prior service cost
29

 
29

 
87

 
87

 
115

 
115

Net periodic benefit cost
$
4,853

 
$
3,351

 
$
14,560

 
$
10,052

 
$
17,909

 
$
13,262


During the nine months ended September 30, 2012, the Company contributed $16.4 million of its projected $19.8 million 2012 annual contribution to its retirement plans.
Other Postretirement Benefits
The net periodic benefit cost recognized for the three, nine and twelve months ended months ended September 30, 2012 and 2011 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,
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
1,095

 
$
747

 
$
3,284

 
$
2,241

 
$
4,031

 
$
3,131

Interest cost
1,413

 
1,345

 
4,238

 
4,034

 
5,583

 
5,700

Expected return on plan assets
(397
)
 
(455
)
 
(1,285
)
 
(1,367
)
 
(1,741
)
 
(1,749
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service benefit
(1,470
)
 
(1,482
)
 
(4,408
)
 
(4,445
)
 
(5,890
)
 
(5,162
)
Net loss (gain)
154

 
(11
)
 
461

 
(30
)
 
452

 
(74
)
Net periodic benefit cost
$
795

 
$
144

 
$
2,290

 
$
433

 
$
2,435

 
$
1,846



During the nine months ended September 30, 2012, the Company contributed $1.8 million of its projected $3.7 million 2012 annual contribution to its postretirement plan.