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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]        
Net earnings available to common stockholders $ 6,634 $ 3,120 $ 5,332 $ 3,866
Other comprehensive income (loss):        
Currency translation adjustment, net of taxes of $37 in the three months ended June 30, 2018, $153 in the three months ended June 30, 2017, $12 in the six months ended June 30, 2018 and $184 in the six months ended June 30, 2017 (7,448) 5,661 (3,431) 7,572
Unrealized gains (losses) on marketable securities arising during the period, net of taxes of $0 in the three months ended June 30, 2018, $7 in the three months ended June 30, 2017, ($20) in the six months ended June 30, 2018 and ($170) in the six months ended June 30, 2017 0 12 (31) (267)
Change in unfunded SERP liability, net of taxes of $25 in the three months ended June 30, 2018, $32 in the three months ended June 30, 2017, $51 in the six months ended June 30, 2018 and $65 in the six months ended June 30, 2017 85 61 171 122
Other comprehensive income (loss) (7,363) 5,734 (3,291) 7,427
Comprehensive income (loss) $ (729) $ 8,854 $ 2,041 $ 11,293