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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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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

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