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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Benefit Plans [Abstract]  
Pension Expense
Pension expense includes the following:
 
 
 
Three months ended
September 30,
 
 
Nine months ended
September 30,
 
 
 
2018
 
 
2017
 
 
2018
 
 
2017
 
 
 
(In thousands)
 
 
 
 
 
Service cost
 
$
76
 
 
$
68
 
 
$
228
 
 
$
204
 
Interest cost
 
 
55
 
 
 
50
 
 
 
165
 
 
 
150
 
Expected return on assets
 
 
(111
)
 
 
(90
)
 
 
(333
)
 
 
(270
)
Amortization of prior service cost and net loss
 
 
(10
)
 
 
(6
)
 
 
(30
)
 
 
(18
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pension expense
 
$
10
 
 
$
22
 
 
$
30
 
 
$
66