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STOCKHOLDERS' EQUITY - Changes in AOCI by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Balance at beginning of period $ 399,980 $ 402,302 $ 404,879 $ 393,217 $ 393,969 $ 520,988 $ 404,879 $ 520,988
Net unrealized gains (losses) arising during the period 4,139 15,562 15,002 764 788 (6,853)    
Less: Net realized gains (losses) reclassified to net (loss) income 13,431 6,264 775 (2,016) (1,794) (1,334)    
Net change during the period (9,292) 9,298 14,227 2,780 2,582 (5,519) 14,233 (157)
Balance at end of period 386,194 399,980 402,302 397,365 393,217 393,969 386,194 397,365
Other comprehensive income (loss) before reclassifications, tax expense (benefit) 1,400 5,000 5,200 200 200 (1,800)    
Reclassification from AOCI, current period, tax expense (benefit) 4,500 2,100 300 (700) (600) (500)    
Total                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Balance at beginning of period 31,158 21,860 7,633 (6,915) (9,497) (3,978) 7,633 (3,978)
Balance at end of period 21,866 31,158 21,860 (4,135) (6,915) (9,497) 21,866 (4,135)
Foreign Currency Translation                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Balance at beginning of period (1,818) (2,485) (2,182) (3,184) (3,502) (1,866) (2,182) (1,866)
Net unrealized gains (losses) arising during the period (105) 667 (303) 262 318 (1,636)    
Less: Net realized gains (losses) reclassified to net (loss) income 0 0 0 0 0 0    
Net change during the period (105) 667 (303) 262 318 (1,636)    
Balance at end of period (1,923) (1,818) (2,485) (2,922) (3,184) (3,502) (1,923) (2,922)
Derivative Instruments                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Balance at beginning of period 32,976 24,345 9,815 (3,731) (5,995) (2,112) 9,815 (2,112)
Net unrealized gains (losses) arising during the period 4,244 14,895 15,305 502 470 (5,217)    
Less: Net realized gains (losses) reclassified to net (loss) income 13,431 6,264 775 (2,016) (1,794) (1,334)    
Net change during the period (9,187) 8,631 14,530 2,518 2,264 (3,883)    
Balance at end of period $ 23,789 $ 32,976 $ 24,345 $ (1,213) $ (3,731) $ (5,995) $ 23,789 $ (1,213)