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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The net pension and postretirement benefit costs that have been recognized during the stated periods are shown in the following tables:
 
Pension
Postretirement
 
Three Months Ended June 30,
 
Three Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
Service cost
$
2,011

 
$
2,102

 
$
249

 
$
227

Interest cost
3,953

 
4,321

 
240

 
242

Expected return on plan assets
(5,966
)
 
(6,369
)
 
—

 
—

Amortization of prior service cost
322

 
327

 
6

 
6

Amortization of losses
4,791

 
4,394

 
218

 
156

Net periodic benefit cost
$
5,111

 
$
4,775

 
$
713

 
$
631

 
Pension
 
Postretirement
 
Six Months Ended
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
Service cost
$
4,430

 
$
4,042

 
$
498

 
$
437

Interest cost
8,787

 
8,309

 
480

 
465

Expected return on plan assets
(13,390
)
 
(12,248
)
 
—

 
—

Amortization of prior service cost
710

 
629

 
13

 
12

Amortization of losses
10,516

 
8,451

 
436

 
299

Net periodic benefit cost
$
11,053

 
$
9,183

 
$
1,427

 
$
1,213