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Pension Plans And Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Components of Net Periodic Benefit Cost
 
Pension Benefits
 
Other Post-retirement Benefits
 
2013
 
2012
 
2013
 
2012
Three months ended June 30:
 
 
 
 
 
 
 
Service cost
$
4,743

 
$
3,891

 
$
1,032

 
$
689

Interest cost
5,978

 
6,084

 
1,390

 
1,256

Expected return on plan assets
(6,900
)
 
(5,950
)
 
(400
)
 
(375
)
Transition obligation recognition
—

 
—

 
—

 
125

Amortization of prior service cost
75

 
75

 
(37
)
 
(37
)
Net loss recognition
3,222

 
3,021

 
1,426

 
1,252

Net periodic benefit cost
$
7,118

 
$
7,121

 
$
3,411

 
$
2,910

Six months ended June 30:
 
 
 
 
 
 
 
Service cost
$
9,486

 
$
7,682

 
$
2,064

 
$
1,378

Interest cost
11,956

 
12,193

 
2,780

 
2,537

Expected return on plan assets
(13,800
)
 
(11,950
)
 
(800
)
 
(750
)
Transition obligation recognition
—

 
—

 
—

 
250

Amortization of prior service cost
150

 
150

 
(74
)
 
(74
)
Net loss recognition
6,769

 
5,778

 
2,947

 
2,564

Net periodic benefit cost
$
14,561

 
$
13,853

 
$
6,917

 
$
5,905