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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of benefit expense
The components of the employee benefit plans expense consisted of the following:
 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(in thousands)
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Interest cost
 
$
5,925

 
$
6,486

 
$
11,850

 
$
12,971

Expected return on plan assets, net of expenses
 
(5,733
)
 
(4,360
)
 
(11,465
)
 
(8,720
)
Amortization of actuarial loss
 
920

 
1,084

 
1,841

 
2,168

Total for defined benefit pension plans
 
1,112

 
3,210


2,226


6,419

Multi-employer plans
 
44

 
59

 
91

 
133

SERPs
 
277

 
257

 
551

 
515

Defined contribution plan
 
1,978

 
1,957

 
4,771

 
4,861

Net periodic benefit cost
 
3,411

 
5,483

 
7,639

 
11,928

Allocated to discontinued operations
 
(174
)
 
(177
)
 
(377
)
 
(368
)
Net periodic benefit cost — continuing operations
 
$
3,237


$
5,306


$
7,262


$
11,560