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Pension and Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic (Benefit) Cost
The components of net periodic (benefit) cost for the three months ended March 31, are summarized below: 
 
Pension Plan and SERP
 
Postretirement Plan
 
Three Months Ended March 31,
 
2014
 
2013
 
2014
 
2013
Interest cost
$
4,813

 
$
4,427

 
$
163

 
$
150

Expected return on plan assets
 
(8,513
)
 
 
(7,597
)
 
 
(200
)
 
 
(212
)
Amortization of prior service credit
 
—

 
 
—

 
 
(36
)
 
 
(38
)
Amortization of net actuarial loss
 
152

 
 
1,289

 
 
176

 
 
150

Net periodic (benefit) cost
$
(3,548
)
 
$
(1,881
)
 
$
103

 
$
50

Employer contributions
$
195

 
$
100

 
$
—

 
$
—