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Components of net periodic benefit cost
 3 Months Ended
Mar. 31, 2012
Components of net periodic benefit cost [Abstract]  
Components of net periodic benefit cost
Components of net periodic benefit cost

 
Pension Benefits
 
Other Postretirement Benefits
 
Three months ended March 31,
 
Three months ended March 31,
 
2012
2011
 
2012
2011
Service cost
$
895

$
858

 
$
525

$
359

Interest cost
1,830

1,680

 
1,486

1,386

Expected return on plan assets
(1,700
)
(1,540
)
 
—

—

Amortization of prior service cost (1)
35

35

 
(1,060
)
(15,155
)
Amortization of net loss
688

482

 
1,496

5,803

Net periodic benefit cost
$
1,748

$
1,515

 
$
2,447

$
(7,607
)
(1)
Plan amendments made in November 2010 resulted in a reduction in OPEB liability and a credit to accumulated other comprehensive loss. The resulting prior service benefit and actuarial losses were amortized ratably into income over the period November 1, 2010 to June 30, 2011 at which time the CAWV OPEB plan terminated.

Employer contributions
During the three months ended March 31, 2012, we have made contributions of approximately $3,900 to the qualified defined benefit plans we sponsor, including both qualified defined benefit plan and non-qualified SERB contributions.