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Defined Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Cost (Benefit)
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Expected return on plan assets, net of expenses
$
(2,780
)
 
$
(2,889
)
 
$
(5,559
)
 
$
(5,779
)
Interest cost on projected benefit obligation
1,548

 
1,749

 
3,095

 
3,498

Net amortization and deferral
1,358

 
1,553

 
2,715

 
3,106

SERP settlement costs
—

 
187

 
—

 
187

Net periodic expense (benefit)
$
126

 
$
600

 
$
251

 
$
1,012