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COMMON STOCK AND EARNINGS PER SHARE - Anti-dilutive Securities and Convertible Notes (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2020	Mar. 31, 2020	Mar. 15, 2020	Feb. 04, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	39,558	7,500	15,000
Interest rate (as a percent)				0.22%	0.7325%
Additional diluted outstanding shares related to Convertible Notes	0
4.50% Convertible Senior Notes due 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate (as a percent)						4.50%
Conversion price per share (in dollars per share)						$ 68.90
3.875% Convertible Senior Notes due 2025
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate (as a percent)	3.875%						3.875%
Conversion price per share (in dollars per share)	$ 54.77