EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		12 Months Ended
	Feb. 18, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018
Stock-based compensation plans
Dividends declared per common share (in dollars per share)	$ 0.38738		$ 0.39	$ 0.38738
Shares of common stock authorized for issuance		4,650,000
Unrecognized share-based compensation
Unrecognized compensation cost		$ 17.7
Weighted-average period of recognition		1 year 9 months 18 days
Maximum
Stock-based compensation plans
Shares that may be granted in the form of stock options or stock appreciation rights to any eligible employee or director in any calendar year		300,000
Restricted stock
Shares
Non-vested shares outstanding at the beginning of the period		532,445
Shares granted		847,809
Shares forfeited, cancelled or retired		(4,579)
Non-vested shares outstanding at the end of the period		1,375,675
Weighted Average Grant Date Fair Value
Non-vested shares outstanding at the beginning of the period (in dollars per share)		$ 11.58
Shares granted (in dollars per share)		6.31
Shares forfeited, cancelled or retired (in dollars per share)		11.29
Non-vested shares outstanding at the end of the period (in dollars per share)		$ 8.21
Performance shares
Shares
Non-vested shares outstanding at the beginning of the period		275,995
Shares granted		240,669
Shares forfeited, cancelled or retired		(3,162)
Non-vested shares outstanding at the end of the period		513,502
Weighted Average Grant Date Fair Value
Non-vested shares outstanding at the beginning of the period (in dollars per share)		$ 13.29
Shares granted (in dollars per share)		9.86
Shares forfeited, cancelled or retired (in dollars per share)		12.62
Non-vested shares outstanding at the end of the period (in dollars per share)		$ 11.40