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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of accumulated other comprehensive income (loss)
Accumulated other comprehensive income consisted of the following (in thousands):
 
Minimum pension liability
 
Foreign currency translation
 
Sale of equity investment
 
Total accumulated other comprehensive income
Balances at December 31, 2015
$
(576
)
 
$
673

 
$
90

 
$
187

Other comprehensive income (loss)
75

 
(75
)
 
(90
)
 
(90
)
Balances at December 31, 2016
(501
)
 
598

 
—

 
97

Other comprehensive income (loss)
12

 
123

 
—

 
135

Balances at December 31, 2017
$
(489
)
 
$
721

 
$
—

 
$
232