CAPITAL STOCK AND SHARE-BASED COMPENSATION - Employee Stock Purchase Plan Purchases (Details) - $ / shares	3 Months Ended								67 Months Ended	91 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Stock Purchase Plan shares issued (shares)	6,063	7,216	8,230	7,181	7,856	6,052	8,673	10,913	3,089,489	3,151,673
Price per Employee Stock Purchase Plan share issued (usd per share)	$ 141.88	$ 111.36	$ 103.20	$ 104.77	$ 99.54	$ 106.22	$ 72.64	$ 51.29	$ 15.25	$ 141.88