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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Schedule of Benefit Obligation
The benefit obligation at December 31, 2017 and December 31, 2016 was calculated as follows:
 
2017
 
2016
 
(Amounts in thousands)
Benefit obligation, January 1
$
4,029

 
$
3,571

Service cost
(650
)
 
(216
)
Interest cost
222

 
199

Loss
1,300

 
475

Benefit obligation, December 31
$
4,901

 
$
4,029
Schedule of Net Periodic Pension Cost
The net periodic pension cost for 2017, 2016 and 2015 was calculated as follows:
 
2017
 
2016
 
2015
 
(Amounts in thousands)
Service cost
$
(650
)
 
$
(216
)
 
$
(86
)
Interest cost
222

 
199

 
214

Loss
1,300

 
475

 
93

 
$
872

 
$
458

 
$
221