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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2015
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, 2015 and 2014 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,
 
2015
 
2014
 
2015
 
2014
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
2,100

 
$
2,173

 
$
8,514

 
$
9,100

Interest cost
3,625

 
3,870

 
14,797

 
14,084

Expected return on plan assets
(4,947
)
 
(4,680
)
 
(18,966
)
 
(17,513
)
Amortization of:
 
 
 
 
 
 
 
Net loss
2,750

 
1,773

 
9,830

 
10,196

Prior service benefit
(888
)
 
(259
)
 
(3,535
)
 
(187
)
Net periodic benefit cost
$
2,640

 
$
2,877

 
$
10,640

 
$
15,680
Other Postretirement Benefit 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, 2015 and 2014 is made up of the components listed below (in thousands): 
 
Three Months Ended
 
Twelve Months Ended
 
March 31,
 
March 31,
 
2015
 
2014
 
2015
 
2014
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
875

 
$
700

 
$
3,020

 
$
3,443

Interest cost
1,025

 
1,125

 
4,363

 
4,906

Expected return on plan assets
(525
)
 
(525
)
 
(2,116
)
 
(2,001
)
Amortization of:
 
 
 
 
 
 
 
Prior service benefit
(775
)
 
(1,200
)
 
(4,328
)
 
(5,432
)
Net gain
(500
)
 
(650
)
 
(2,521
)
 
(1,276
)
Net periodic benefit cost (benefit)
$
100

 
$
(550
)
 
$
(1,582
)
 
$
(360
)