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STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 520,988 $ 473,849 $ 506,063
Net unrealized gains (losses) arising during the period(a) 5,795 (2,347) (853)
Less: Net realized gains (losses) reclassified to net income(b) (5,816) (1,712) 105
Total other comprehensive income (loss) 11,611 (635) (958)
Balance at end of period 404,879 520,988 473,849
Foreign Currency Translation and Other      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (1,866) (2,578) (2,385)
Net unrealized gains (losses) arising during the period(a) (316) 712 (193)
Less: Net realized gains (losses) reclassified to net income(b) 0 0 0
Total other comprehensive income (loss) (316) 712 (193)
Balance at end of period (2,182) (1,866) (2,578)
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (2,112) (765) 0
Net unrealized gains (losses) arising during the period(a) 6,111 (3,059) (660)
Less: Net realized gains (losses) reclassified to net income(b) (5,816) (1,712) 105
Total other comprehensive income (loss) 11,927 (1,347) (765)
Balance at end of period 9,815 (2,112) (765)
Net unrealized gains (losses) arising during period, tax expense (benefit) 2,058 (1,031) (230)
Net realized gains (losses) reclassified to net income, tax expense (benefit) (1,962) (585) 37
AOCI Attributable to Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (3,978) (3,343) (2,385)
Balance at end of period $ 7,633 $ (3,978) $ (3,343)