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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of benefit expense
The components of the expense consisted of the following:
 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(in thousands)
 
2016
 
2015
 
2016
 
2015
 
 
 
 
 
 
 
 
 
Interest cost
 
$
6,770

 
$
8,179

 
$
13,540

 
$
14,628

Expected return on plan assets, net of expenses
 
(4,599
)
 
(6,624
)
 
(9,196
)
 
(11,709
)
Amortization of actuarial loss
 
997

 
1,204

 
1,995

 
2,336

Curtailment
 
—

 
1,080

 
—

 
1,080

Total for defined benefit plans
 
3,168

 
3,839


6,339


6,335

Multi-employer plans
 
42

 
38

 
85

 
97

SERP
 
281

 
281

 
560

 
547

Defined contribution plans
 
2,086

 
2,360

 
4,274

 
5,711

Net periodic benefit cost
 
5,577

 
6,518

 
11,258

 
12,690

Allocated to discontinued operations
 
—

 
—

 
—

 
(1,096
)
Net periodic benefit cost — continuing operations
 
$
5,577


$
6,518


$
11,258


$
11,594