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RETIREMENT PLANS (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Contribution Expense
Our contribution expense is presented in the following table:
TABLE 12.1
 
Nine Months Ended
September 30,
(in thousands)
2018
 
2017
401(k) contribution expense
$
11,210

 
$
9,081
Net Periodic Benefit Credit for Defined Benefit Plans
The net periodic benefit credit for these plans includes the following components:
TABLE 12.2
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(in thousands)
2018
 
2017
 
2018
 
2017
Service cost
$
(3
)
 
$
(3
)
 
$
(11
)
 
$
(11
)
Interest cost
1,549

 
1,463

 
4,669

 
4,417

Expected return on plan assets
(2,946
)
 
(2,427
)
 
(8,736
)
 
(7,281
)
Amortization:
 
 
 
 
 
 
 
Unrecognized prior service cost
1

 
2

 
1

 
6

Unrecognized loss
596

 
603

 
1,842

 
1,859

Net periodic pension credit
$
(803
)
 
$
(362
)
 
$
(2,235
)
 
$
(1,010
)