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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
 
(in thousands)
Service cost
$
52

 
$
44

 
$
104

 
$
88

Interest cost
246

 
237

 
492

 
474

Expected return on plan assets
(283
)
 
(321
)
 
(567
)
 
(641
)
Amortization of net actuarial loss/prior service cost
206

 
201

 
412

 
403

Net periodic cost recognized
$
221

 
$
161

 
$
441

 
$
324