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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Pension Expense Related to Qualified and Non-Qualified Plans
The following table sets forth the components of net periodic pension expense related to the qualified and non-qualified plans for the three and six months ended June 30, 2014 and 2013: 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Service cost
$
—

 
$
2,056

 
$
—

 
$
4,043

Interest cost
1,732

 
1,708

 
3,463

 
3,365

Expected return on plan assets
(3,243
)
 
(3,183
)
 
(6,485
)
 
(5,742
)
Amortization of prior service cost
—

 
241

 
—

 
443

Amortization of actuarial loss
62

 
811

 
124

 
1,605

Curtailment loss
—

 
750

 
—

 
750

Total net periodic pension (income) expense
$
(1,449
)
 
$
2,383

 
$
(2,898
)
 
$
4,464