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Pension Benefits (Tables)
9 Months Ended
Sep. 30, 2016
Pension Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The net periodic pension cost for the three and nine months ended September 30, 2016 and 2015 were as follows (in thousands):
 
 
Three months ended
September 30,
Nine months ended
September 30,
2016
2015
2016
2015
Components of net periodic benefit cost
Service cost
$
368
$
400
$
1,104
$
1,200
Interest cost
344
325
1,032
975
Expected return on plan assets
(563
)
(525
)
(1,689
)
(1,575
)
Recognized net actuarial loss
314
300
942
900
Net periodic pension cost
$
463
$
500
$
1,389
$
1,500