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Pension and Postretirement Benefits Other than Pensions (Tables)
 6 Months Ended
Jun. 30, 2012
Pension Plans, Defined Benefit [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
Pension expense for the three and six months ended June 30, 2012 and 2011 for the defined benefit plans consists of the following components:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
2011
 
2012
2011
Service cost
$
883

$
947

 
$
2,081

$
1,957

Interest cost
1,939

3,301

 
6,269

6,556

Expected return on plan assets
(1,680
)
(3,293
)
 
(6,036
)
(6,457
)
Amortization of prior service cost
(62
)
(71
)
 
(136
)
(138
)
Amortization of net loss
1,217

912

 
2,742

1,967

Net periodic pension expense
$
2,297

$
1,796

 
$
4,920

$
3,885
Defined Benefit Postretirement Health Coverage [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
The components of the postretirement benefit expense of the Company-sponsored plans for the three and six months ended June 30, 2012 and 2011 are as follows:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
2011
 
2012
2011
Service cost
$
44

$
46

 
$
94

$
96

Interest cost
284

679

 
634

1,329

Amortization of prior service cost
(390
)
(32
)
 
(765
)
(64
)
Amortization of net loss
378

445

 
903

927

Postretirement benefit expense
$
316

$
1,138

 
$
866

$
2,288