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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2014
Retirement Plans
  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
The net periodic benefit cost recognized for the three and twelve months ended March 31, 2014 and 2013 is made up of the components listed below as determined using the projected unit credit actuarial cost method (in thousands):
 
 
Three Months Ended
 
Twelve Months Ended
 
March 31,
 
March 31,
 
2014
 
2013
 
2014
 
2013
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
2,173

 
$
2,400

 
$
9,100

 
$
9,004

Interest cost
3,870

 
3,400

 
14,084

 
13,579

Expected return on plan assets
(4,680
)
 
(4,275
)
 
(17,513
)
 
(15,108
)
Amortization of:
 
 
 
 
 
 
 
Net loss
1,773

 
2,675

 
10,196

 
11,066

Prior service (benefit) cost
(259
)
 
25

 
(187
)
 
113

Net periodic benefit cost
$
2,877

 
$
4,225

 
$
15,680

 
$
18,654
Other Postretirement Benefit Plans, Defined Benefit
  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
The net periodic benefit cost recognized for the three and twelve months ended March 31, 2014 and 2013 is made up of the components listed below (in thousands): 
 
Three Months Ended
 
Twelve Months Ended
 
March 31,
 
March 31,
 
2014
 
2013
 
2014
 
2013
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
700

 
$
1,100

 
$
3,443

 
$
4,408

Interest cost
1,125

 
1,375

 
4,906

 
5,611

Expected return on plan assets
(525
)
 
(475
)
 
(2,001
)
 
(1,754
)
Amortization of:
 
 
 
 
 
 
 
Prior service benefit
(1,200
)
 
(1,425
)
 
(5,432
)
 
(5,832
)
Net (gain) loss
(650
)
 
—

 
(1,276
)
 
455

Net periodic benefit cost (benefit)
$
(550
)
 
$
575

 
$
(360
)
 
$
2,888