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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Components of benefit expense
The components of the employee benefit plans expense consisted of the following:
 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
(in thousands)
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Interest cost
 
$
5,962

 
$
6,504

 
$
17,812

 
$
19,475

Expected return on plan assets, net of expenses
 
(5,734
)
 
(4,360
)
 
(17,199
)
 
(13,079
)
Amortization of actuarial loss
 
1,026

 
1,150

 
2,867

 
3,318

Total for defined benefit pension plans
 
1,254

 
3,294


3,480


9,714

Multi-employer plans
 
50

 
58

 
141

 
191

SERPs
 
2,275

 
257

 
2,826

 
771

Defined contribution plan
 
2,137

 
2,300

 
6,908

 
7,161

Net periodic benefit cost
 
5,716

 
5,909

 
13,355

 
17,837

Allocated to discontinued operations
 
(132
)
 
(179
)
 
(509
)
 
(547
)
Net periodic benefit cost — continuing operations
 
$
5,584


$
5,730


$
12,846


$
17,290