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Retirement and Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2016
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
 
2016
 
2015
 
2016
 
2015
 
(thousands)
Service cost
$
279

 
$
12

 
$
846

 
$
726

Interest cost
4,805

 
4,808

 
14,376

 
14,259

Expected return on plan assets
(5,131
)
 
(5,844
)
 
(15,310
)
 
(16,539
)
Amortization of actuarial loss
584

 
987

 
1,540

 
3,897

Plan settlement loss

 

 
297

 
501

Net periodic benefit expense
$
537

 
$
(37
)
 
$
1,749

 
$
2,844