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STOCK-BASED COMPENSATION - Common Stock Repurchases (Details) - USD ($)
shares in Millions
3 Months Ended 9 Months Ended 67 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]                  
Authorized repurchase amount $ 600,000,000.0           $ 600,000,000.0   $ 600,000,000.0
Repurchases of common stock (in shares) 0.1     0.1     0.2 0.6 5.8
Repurchases of common stock $ 5,118,000 $ 4,948,000 $ 6,324,000 $ 7,099,000 $ 12,218,000 $ 14,264,000 $ 16,400,000 $ 33,600,000 $ 310,300,000
Remaining available repurchase amount $ 289,700,000           $ 289,700,000   $ 289,700,000