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

 
$
4,743

 
$
499

 
$
971

Interest cost
6,706

 
5,978

 
1,353

 
1,373

Expected return on plan assets
(8,110
)
 
(6,900
)
 
(472
)
 
(402
)
Amortization of prior service cost
6

 
75

 
(43
)
 
(37
)
Net loss recognition
1,163

 
3,220

 
826

 
1,395

Net periodic benefit cost
$
3,633

 
$
7,116

 
$
2,163

 
$
3,300

Nine months ended September 30:
 
 
 
 
 
 
 
Service cost
$
12,754

 
$
14,229

 
$
1,972

 
$
3,035

Interest cost
20,118

 
17,934

 
4,059

 
4,153

Expected return on plan assets
(24,330
)
 
(20,700
)
 
(1,416
)
 
(1,202
)
Amortization of prior service cost
18

 
225

 
(129
)
 
(111
)
Net loss recognition
2,334

 
9,989

 
2,001

 
4,342

Net periodic benefit cost
$
10,894

 
$
21,677

 
$
6,487

 
$
10,217