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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Loss      
Balance at beginning of period $ 1,314,288    
Other comprehensive income (loss) before reclassifications 6,016 $ 482 $ (4,041)
Amounts reclassified to earnings     (52)
Other comprehensive income 6,016 482 (4,093)
Balance at end of period 1,272,290 1,314,288  
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Loss      
Balance at beginning of period (1,379) (1,864) 2,232
Other comprehensive income (loss) before reclassifications 6,016 485 (4,044)
Amounts reclassified to earnings     (52)
Other comprehensive income 6,016 485 (4,096)
Balance at end of period 4,637 (1,379) (1,864)
Unrealized Gains On Available-For-Sale Debt Securities      
Accumulated Other Comprehensive Loss      
Balance at beginning of period 0 3 0
Other comprehensive income (loss) before reclassifications 0 (3) 3
Amounts reclassified to earnings     0
Other comprehensive income 0 (3) 3
Balance at end of period 0 0 3
Accumulated Other Comprehensive (Loss) Income      
Accumulated Other Comprehensive Loss      
Balance at beginning of period (1,379) (1,861) 2,232
Balance at end of period $ 4,637 $ (1,379) $ (1,861)