Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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COMMON STOCK AND EARNINGS PER SHARE - Anti-dilutive Securities and Convertible Notes (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2015	Mar. 11, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	7,500	15,000	57,750
Additional diluted outstanding shares related to Convertible Notes	0	0	0
4.50% Convertible Senior Notes due 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stated interest rate (as a percent)	4.50%	4.50%
Conversion price per share			$ 68.11	$ 68.11	$ 68.90