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RETIREMENT PLANS (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Contribution Expense
Our contribution expense is presented in the following table:

 
Nine Months Ended
September 30,
(in thousands)
2017
 
2016
401(k) contribution expense
$
9,081

 
$
6,941
Net Periodic Benefit Credit for Defined Benefit Plans
The net periodic benefit credit for these plans includes the following components:

 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(in thousands)
2017
 
2016
 
2017
 
2016
Service cost
$
(3
)
 
$
(4
)
 
$
(11
)
 
$
(12
)
Interest cost
1,463

 
1,521

 
4,417

 
4,609

Expected return on plan assets
(2,427
)
 
(2,354
)
 
(7,281
)
 
(7,060
)
Amortization:
 
 
 
 
 
 
 
Unrecognized prior service cost
2

 
2

 
6

 
6

Unrecognized loss
603

 
584

 
1,859

 
1,800

Net periodic pension credit
$
(362
)
 
$
(251
)
 
$
(1,010
)
 
$
(657
)