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Pension Plans And Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2014
Components of Net Periodic Benefit Cost
 
Pension Benefits
 
Other Post-retirement Benefits
 
2014
 
2013
 
2014
 
2013
Three months ended June 30:
 
 
 
 
 
 
 
Service cost
$
3,868

 
$
4,743

 
$
499

 
$
1,032

Interest cost
6,706

 
5,978

 
1,353

 
1,390

Expected return on plan assets
(8,110
)
 
(6,900
)
 
(472
)
 
(400
)
Amortization of prior service cost
6

 
75

 
(43
)
 
(37
)
Net loss recognition
14

 
3,222

 
349

 
1,426

Net periodic benefit cost
$
2,484

 
$
7,118

 
$
1,686

 
$
3,411

Six months ended June 30:
 
 
 
 
 
 
 
Service cost
$
8,886

 
$
9,486

 
$
1,473

 
$
2,064

Interest cost
13,412

 
11,956

 
2,706

 
2,780

Expected return on plan assets
(16,220
)
 
(13,800
)
 
(944
)
 
(800
)
Amortization of prior service cost
12

 
150

 
(86
)
 
(74
)
Net loss recognition
1,171

 
6,769

 
1,175

 
2,947

Net periodic benefit cost
$
7,261

 
$
14,561

 
$
4,324

 
$
6,917