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Employee benefit plans
 9 Months Ended
Sep. 30, 2012
Employee Benefit Plans [Abstract]  
Pension and Other Postretirement Benefits Disclosure
Employee benefit plans
The Company has noncontributory defined benefit pension plans and other postretirement benefit plans for certain eligible employees. Components of net periodic benefit cost for the Company's pension and other postretirement benefit plans were as follows:
 
 
 
Other
 
 
 
Postretirement
 
Pension Benefits
Benefits
Three Months Ended September 30,
2012

2011

2012

2011

 
(In thousands)
Components of net periodic benefit cost:
 
 
 
 
Service cost
$
349

$
35

$
437

$
361

Interest cost
4,407

4,706

943

1,175

Expected return on assets
(5,865
)
(5,679
)
(1,222
)
(1,263
)
Amortization of prior service credit
(22
)
(54
)
(534
)
(669
)
Amortization of net actuarial loss
1,887

917

356

430

Amortization of net transition obligation
—

—

531

532

Curtailment gain
(1,023
)
—

—

—

Net periodic benefit cost, including amount capitalized
(267
)
(75
)
511

566

Less amount capitalized
185

323

314

(41
)
Net periodic benefit cost
$
(452
)
$
(398
)
$
197

$
607

 
 
 
 
 
 
 
 
Other
 
 
 
Postretirement
 
Pension Benefits
Benefits
Nine Months Ended September 30,
2012

2011

2012

2011

 
(In thousands)
Components of net periodic benefit cost:
 
 
 
 
Service cost
$
1,044

$
1,689

$
1,310

$
1,083

Interest cost
13,223

14,625

3,124

3,525

Expected return on assets
(17,596
)
(17,106
)
(3,667
)
(3,789
)
Amortization of prior service cost (credit)
(64
)
33

(1,078
)
(2,007
)
Amortization of net actuarial loss
5,670

3,509

1,769

688

Amortization of net transition obligation
—

—

1,594

1,594

Curtailment (gain) loss
(1,023
)
1,218

—

—

Net periodic benefit cost, including amount capitalized
1,254

3,968

3,052

1,094

Less amount capitalized
615

858

635

(136
)
Net periodic benefit cost
$
639

$
3,110

$
2,417

$
1,230


Defined pension plan benefits to all nonunion and certain union employees hired after December 31, 2005, were discontinued. Employees that would have been eligible for defined pension plan benefits are eligible to receive additional defined contribution plan benefits. Effective January 1, 2010, all benefit and service accruals for nonunion and certain union plans were frozen. Effective June 30, 2011 and September 30, 2012, all benefit and service accruals for certain additional union employees were frozen. These employees will be eligible to receive additional defined contribution plan benefits.

In addition to the qualified plan defined pension benefits reflected in the table, the Company has an unfunded, nonqualified benefit plan for executive officers and certain key management employees that generally provides for defined benefit payments at age 65 following the employee's retirement or to their beneficiaries upon death for a 15-year period. The Company's net periodic benefit cost for this plan for the three and nine months ended September 30, 2012, was $2.0 million and $6.1 million, respectively. The Company's net periodic benefit cost for this plan for the three and nine months ended September 30, 2011, was $2.0 million and $6.0 million, respectively.