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RETIREMENT PLANS (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Contribution Expense
Our contribution expense is presented in the following table:

 
Three Months Ended
March 31,
(in thousands)
2018
 
2017
401(k) contribution expense
$
3,610

 
$
2,767
Net Periodic Benefit Credit for Defined Benefit Plans
The net periodic benefit credit for these plans includes the following components:
 
Three Months Ended
March 31,
(in thousands)
2018
 
2017
Service cost
$
(4
)
 
$
(4
)
Interest cost
1,560

 
1,477

Expected return on plan assets
(2,895
)
 
(2,427
)
Amortization:
 
 
 
Unrecognized prior service cost
—

 
2

Unrecognized loss
623

 
628

Net periodic pension credit
$
(716
)
 
$
(324
)