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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block] Employee Benefit Plans
 
We sponsor and/or contribute to pension and postretirement health care and life insurance benefit plans for eligible employees. 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 June 30,
 
Three Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Components of Net Periodic Benefit Cost (Income)
 
 
 
 
 
 
 
Service cost
$
2,322

 
$
2,684

 
$
77

 
$
87

Interest cost
6,615

 
6,102

 
150

 
142

Expected return on plan assets
(6,360
)
 
(7,044
)
 
(217
)
 
(238
)
Amortization of prior service cost (credit)
1,620

 
1

 
(470
)
 
(470
)
Recognized actuarial loss (gain)
—

 
1,108

 
(24
)
 
(20
)
Net Periodic Benefit Cost (Income)
$
4,197

 
$
2,851

 
$
(484
)
 
$
(499
)

 
Pension Benefits
 
Other Postretirement Benefits
 
Six Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Components of Net Periodic Benefit Cost (Income)
 
 
 
 
 
 
 
Service cost
$
4,819

 
$
5,888

 
$
166

 
$
199

Interest cost
13,244

 
12,210

 
305

 
289

Expected return on plan assets
(12,722
)
 
(14,104
)
 
(435
)
 
(477
)
Amortization of prior service cost
3,272

 
2

 
(941
)
 
(941
)
Recognized actuarial loss (gain)
—

 
2,180

 
(48
)
 
(40
)
Net Periodic Benefit Cost (Income)
$
8,613

 
$
6,176

 
$
(953
)
 
$
(970
)


During 2019, we have funded $3.0 million and expect to contribute an additional $10.2 million to our pension plans.