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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 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
September 30,

 

 

Nine Months Ended
September 30,

 

(in thousands)

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Expense:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service costs

$

184

  

 

$

260

  

 

$

551

  

 

$

781

  

Interest costs

 

2,086

  

 

 

5,999

  

 

 

11,185

  

 

 

18,000

  

Settlement costs

 

152,388

 

 

 

—

 

 

 

152,388

 

 

 

—

 

Expected return on plan assets

 

—

 

 

 

(3,083

) 

 

 

(4,740

) 

 

 

(9,250

) 

Amortization of net actuarial loss

 

1,958

  

 

 

7,043

  

 

 

15,792

  

 

 

21,153

  

Amortization of prior service credit

 

(1,045

) 

 

 

(1,211

) 

 

 

(3,268

) 

 

 

(3,633

) 

 

$

155,571

  

 

$

9,008

  

 

$

171,908

  

 

$

27,051