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SHAREHOLDERS' EQUITY - Summary of the Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax, by Component (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance $ 3,975,537 $ 4,012,223 $ 4,326,238 $ 4,382,735 $ 4,012,223 $ 4,382,735
Other comprehensive income 516 516 224 225 1,032 449
Balance 3,461,006 3,975,537 $ 4,318,620 $ 4,326,238 3,461,006 $ 4,318,620
Defined Benefit Pension Plan            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance (28,119) (28,635)     (28,635)  
Amounts reclassified from accumulated other comprehensive loss 516       1,032  
Other comprehensive income 516       1,032  
Balance $ (27,603) $ (28,119)     $ (27,603)