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Employee Benefits
 6 Months Ended
Jun. 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, six and twelve months ended June 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
 
Six Months Ended
 
Twelve Months Ended
 
June 30,
 
June 30,
 
June 30,
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
2,189

 
$
1,682

 
$
4,414

 
$
3,425

 
$
7,839

 
$
6,457

Interest cost
3,400

 
3,499

 
6,778

 
6,994

 
13,771

 
13,808

Amendments
—

 
—

 
—

 
—

 
—

 
838

Expected return on plan assets
(3,611
)
 
(3,515
)
 
(7,221
)
 
(7,048
)
 
(14,268
)
 
(13,982
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Net loss
2,713

 
1,689

 
5,678

 
3,272

 
8,950

 
5,047

Prior service cost
31

 
31

 
58

 
58

 
115

 
115

Net periodic benefit cost
$
4,722

 
$
3,386

 
$
9,707

 
$
6,701

 
$
16,407

 
$
12,283


During the six months ended June 30, 2012, the Company contributed $11.5 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, six and twelve months ended June 30, 2012 and 2011 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,
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
1,119

 
$
756

 
$
2,189

 
$
1,494

 
$
3,683

 
$
3,273

Interest cost
1,410

 
1,399

 
2,825

 
2,689

 
5,515

 
6,021

Expected return on plan assets
(453
)
 
(454
)
 
(888
)
 
(912
)
 
(1,799
)
 
(1,676
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service benefit
(1,468
)
 
(1,481
)
 
(2,938
)
 
(2,963
)
 
(5,902
)
 
(4,397
)
Net loss (gain)
147

 
89

 
307

 
(19
)
 
287

 
(107
)
Net periodic benefit cost
$
755

 
$
309

 
$
1,495

 
$
289

 
$
1,784

 
$
3,114



During the six months ended June 30, 2012, the Company contributed $0.6 million of its projected $2.5 million 2012 annual contribution to its postretirement plan.