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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2014
Pension Benefits
  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
or the pension and postretirement benefit plans maintained by the Company for the three months ended March 31, 2014 and 2013:
 
 
Pension Benefits
(in thousands)
Three months ended
March 31,
2014
 
2013
Service cost
$
43

 
$
—

Interest cost
1,162

 
1,065

Expected return on plan assets
(1,905
)
 
(1,755
)
Recognized net actuarial loss
207

 
392

Benefit income
$
(493
)
 
$
(298
)
Postretirement Benefits
  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures