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Level 3 Retirement and Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2013
Retirement and Benefit Plans [Abstract]  
Retirement and Benefit Plans [Table Text Block]
The following table presents the pension benefit costs:
 
 
Three Months Ended June 30
 
Six Months Ended
June 30
 
2013
 
2012
 
2013
 
2012
 
(thousands)
Service cost
$
671

 
$
1,182

 
$
1,342

 
$
2,351

Interest cost
4,650

 
4,824

 
9,292

 
9,667

Expected return on plan assets
(4,916
)
 
(4,847
)
 
(9,782
)
 
(9,691
)
Amortization of actuarial loss
2,281

 
1,958

 
4,537

 
3,984

Amortization of prior service costs
22

 
42

 
45

 
83

Net periodic benefit cost
$
2,708

 
$
3,159

 
$
5,434

 
$
6,394