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STOCKHOLDERS' EQUITY - Accumulted Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 506,063 $ 472,391 $ 439,809
Net unrealized gains (losses) arising during the period (853) 462 (1,347)
Less: Net realized gains (losses) reclassified to net income 105 0 0
Net change during the period (958) 462 (1,347)
Balance at end of period 473,849 506,063 472,391
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net unrealized gains (losses) arising during period, tax 230    
Net realized gains (losses) reclassified to net income, tax 37    
Foreign Currency Translation and Other      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (2,385) (2,847) (1,500)
Net unrealized gains (losses) arising during the period (193) 462 (1,347)
Less: Net realized gains (losses) reclassified to net income 0 0 0
Net change during the period (193) 462 (1,347)
Balance at end of period (2,578) (2,385) (2,847)
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period 0 0 0
Net unrealized gains (losses) arising during the period (660) 0 0
Less: Net realized gains (losses) reclassified to net income 105 0 0
Net change during the period (765) 0 0
Balance at end of period (765) 0 0
AOCI Attributable to Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (2,385) (2,847) (1,500)
Balance at end of period $ (3,343) $ (2,385) $ (2,847)