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Employee Benefit Plans (Tables)
 3 Months Ended
Jun. 30, 2012
Pension Benefits
  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
Included as charges against income for the three and six months ended June 30, 2012 and 2011 are the following amounts for pension and postretirement benefit plans maintained by the Company:
 
 
Pension Benefits
Pension Benefits
(in thousands)
Three months ended
June 30,
Six months ended
June 30,
2012
 
2011
2012
 
2011
Service cost
$
—

 
$
—

$
—

 
$
—

Interest cost
1,105

 
1,163

2,248

 
2,289

Expected return on plan assets
(1,534
)
 
(1,558
)
(3,073
)
 
(3,118
)
Recognized net actuarial loss
299

 
247

749

 
470

Benefit cost (income)
$
(130
)
 
$
(148
)
$
(76
)
 
$
(359
)
Postretirement Benefits
  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
 
Postretirement Benefits
Postretirement Benefits
(in thousands)
Three months ended
June 30,
Six months ended
June 30,
2012
 
2011
2012
 
2011
Service cost
$
184

 
$
136

$
376

 
$
277

Interest cost
327

 
325

660

 
643

Amortization of prior service cost
(136
)
 
(136
)
(272
)
 
(272
)
Recognized net actuarial loss
313

 
242

640

 
451

Benefit cost
$
688

 
$
567

$
1,404

 
$
1,099