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STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 473,849 $ 506,063 $ 472,391
Net unrealized gains (losses) arising during the period (2,347) (853) 462
Less: Net realized gains (losses) reclassified to net income (1,712) 105 0
Total other comprehensive (loss) income (635) (958) 462
Balance at end of period 520,988 473,849 506,063
Foreign Currency Translation and Other      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (2,578) (2,385) (2,847)
Net unrealized gains (losses) arising during the period 712 (193) 462
Less: Net realized gains (losses) reclassified to net income 0 0 0
Total other comprehensive (loss) income 712 (193) 462
Balance at end of period (1,866) (2,578) (2,385)
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period     0
Net unrealized gains (losses) arising during the period     0
Less: Net realized gains (losses) reclassified to net income     0
Total other comprehensive (loss) income     0
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 (3,059) (660)  
Less: Net realized gains (losses) reclassified to net income (1,712) 105  
Total other comprehensive (loss) income (1,347) (765)  
Balance at end of period (2,112) (765) 0
Net unrealized gains (losses) arising during period, tax 1,031 230  
Net realized gains (losses) reclassified to net income, tax 585 (37)  
AOCI Attributable to Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (3,343) (2,385) (2,847)
Balance at end of period $ (3,978) $ (3,343) $ (2,385)