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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [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)
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
 
Interest cost
 
$
6,486

 
$
6,770

 
$
12,971

 
$
13,540

Expected return on plan assets, net of expenses
 
(4,360
)
 
(4,599
)
 
(8,720
)
 
(9,196
)
Amortization of actuarial loss
 
1,084

 
997

 
2,168

 
1,995

Total for defined benefit plans
 
3,210

 
3,168


6,419


6,339

Multi-employer plans
 
59

 
42

 
133

 
85

SERPs
 
257

 
281

 
515

 
560

Defined contribution plan
 
1,957

 
2,086

 
4,861

 
4,274

Net periodic benefit cost
 
$
5,483

 
$
5,577

 
$
11,928

 
$
11,258