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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost for pension and postretirement plans
The components of net periodic benefit cost for the pension plans are as follows: 
 
Pension Benefits
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Service cost
$
89

 
$
52

 
$
177

 
$
104

Interest cost
236

 
246

 
471

 
492

Expected return on plan assets
(283
)
 
(283
)
 
(565
)
 
(567
)
Amortization of net actuarial loss/prior service cost
184

 
206

 
368

 
412

Net periodic cost recognized
$
226

 
$
221

 
$
451

 
$
441