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Level 3 Retirement and Benefit Plans (Tables)
9 Months Ended
Sep. 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 September 30
 
Nine Months Ended
September 30
 
2013
 
2012
 
2013
 
2012
 
(thousands)
Service cost
$
672

 
$
1,206

 
$
2,014

 
$
3,557

Interest cost
4,667

 
4,783

 
13,959

 
14,450

Expected return on plan assets
(5,025
)
 
(4,850
)
 
(14,807
)
 
(14,541
)
Amortization of actuarial loss
2,333

 
1,824

 
6,870

 
5,808

Amortization of prior service costs
23

 
41

 
68

 
124

Net periodic benefit cost
$
2,670

 
$
3,004

 
$
8,104

 
$
9,398