Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
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)

2016

 

 

2015

 

Expense:

 

 

 

 

 

 

 

Service costs

$

261

 

 

$

390

 

Interest costs

 

5,964

 

 

 

7,009

 

Expected return on plan assets

 

(3,094

)

 

 

(5,448

)

Amortization of net actuarial loss

 

7,037

 

 

 

8,492

 

Amortization of prior service credit

 

(1,211

)

 

 

(1,041

)

 

$

8,957

 

 

$

9,402