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Retirement and Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [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
 
2015
 
2014
 
2015
 
2014
 
(thousands)
Service cost
$
12

 
$
433

 
$
726

 
$
1,248

Interest cost
4,808

 
5,050

 
14,259

 
15,130

Expected return on plan assets
(5,844
)
 
(5,238
)
 
(16,539
)
 
(15,764
)
Amortization of actuarial (gain) loss
987

 
(5
)
 
3,897

 
(17
)
Plan settlement loss

 

 
501

 

Net periodic benefit (income) expense
$
(37
)
 
$
240

 
$
2,844

 
$
597