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STOCKHOLDERS' EQUITY Changes in AOCI by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 473,849 $ 506,063
Net unrealized gains (losses) arising during the period (391) 409
Less: Net realized gains (losses) reclassified to net income (125) 0
Net change during the period (516) 409
Balance at end of period 483,606 513,272
Foreign Currency Translation and Other    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (2,578) (2,385)
Net unrealized gains (losses) arising during the period 298 409
Less: Net realized gains (losses) reclassified to net income 0
Net change during the period 298 409
Balance at end of period (2,280) (1,976)
Other comprehensive income (loss) before reclassifications, tax 232  
Reclassification from AOCI, current period, tax 42  
Derivative Instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (765) 0
Net unrealized gains (losses) arising during the period (689) 0
Less: Net realized gains (losses) reclassified to net income (125) 0
Net change during the period (814) 0
Balance at end of period (1,579) 0
Accumulated Other Comprehensive Losses    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (3,343) (2,385)
Balance at end of period $ (3,859) $ (1,976)