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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation And Retirement Disclosure [Abstract]  
Net Periodic Cost

Net periodic cost related to the Company’s defined benefit pension and supplemental benefit plans includes the following components:

 

 

Three Months Ended
March 31,

 

(in thousands)

2017

 

 

2016

 

Expense:

 

 

 

 

 

 

 

Service costs

$

184

 

 

$

261

 

Interest costs

 

4,641

 

 

 

5,964

 

Expected return on plan assets

 

(2,370

)

 

 

(3,094

)

Amortization of net actuarial loss

 

6,933

 

 

 

7,037

 

Amortization of prior service credit

 

(1,211

)

 

 

(1,211

)

 

$

8,177

 

 

$

8,957