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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Net periodic benefit cost (income) for our pension and other postretirement plans consists of the following (in thousands):
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended
March 31,
 
Three Months Ended
March 31,
 
2016
 
2015
 
2016
 
2015
Components of Net Periodic Benefit Cost (Income)
 
 
 
 
 
 
 
Service cost
$
2,939

 
$
3,463

 
$
130

 
$
129

Interest cost
6,566

 
6,542

 
202

 
183

Expected return on plan assets
(7,081
)
 
(7,920
)
 
(261
)
 
(243
)
Amortization of prior service cost
62

 
62

 
(471
)
 
(500
)
Recognized actuarial loss
2,466

 
2,618

 
87

 
81

Net Periodic Benefit Cost (Income)
$
4,952

 
$
4,765

 
$
(313
)
 
$
(350
)