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EARNINGS PER SHARE - Share Repurchase (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Jul. 29, 2021
Equity, Class of Treasury Stock [Line Items]          
Amount paid to repurchase shares $ 6,503 $ 7,248 $ 6,503 $ 7,248  
Number of shares repurchased 72,000   72,000 170,000  
Average repurchase price per share $ 90.34   $ 90.34 $ 42.59  
Remaining authorized by Board of Directors for future repurchases as of period end $ 31,866   $ 31,866 $ 42,751  
Shares repurchased from related parties     0    
Subsequent Event [Member]          
Equity, Class of Treasury Stock [Line Items]          
Stock repurchase plan authorized amount         $ 200,000