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Pension and Postretirement Benefits Other than Pensions (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2012 and 2011 for the defined benefit plans consists of the following components:

 
Three months ended September 30,
 
Nine months ended September 30,
 
2012
2011
 
2012
2011
Service cost
$
1,060

$
974

 
$
3,141

$
2,931

Interest cost
3,186

3,279

 
9,455

9,835

Expected return on plan assets
(3,066
)
(3,232
)
 
(9,102
)
(9,689
)
Amortization of prior service cost
(62
)
(72
)
 
(198
)
(210
)
Amortization of net loss
1,375

984

 
4,117

2,951

Net periodic pension expense
$
2,493

$
1,933

 
$
7,413

$
5,818
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 nine months ended September 30, 2012 and 2011 are as follows:

 
Three months ended September 30,
 
Nine months ended September 30,
 
2012
2011
 
2012
2011
Service cost
$
47

$
48

 
$
141

$
144

Interest cost
316

665

 
950

1,994

Amortization of prior service cost
(382
)
(32
)
 
(1,147
)
(96
)
Amortization of net loss
452

464

 
1,355

1,391

Postretirement benefit expense
$
433

$
1,145

 
$
1,299

$
3,433