EARNINGS / (LOSS) PER SHARE - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings per share
Income/(loss) from continuing operations	$ 23,043	$ 20,659	$ (532,074)	$ 68,885
(Loss)/income from discontinued operations	(1,818)	1,957	(15,952)	2,814
Net income/(loss)	$ 21,225	$ 22,616	$ (548,026)	$ 71,699
Average number of common shares issued (in shares)	51,903	51,903	51,903	49,068
Less: average number of treasury shares (in shares)	1,560	1,089	1,674	855
Less: average number of unvested stock award shares (in shares)	536	435	499	410
Plus: average participating preferred shares (in shares)	522	1,043	526	1,043
Average number of basic common shares outstanding (in shares)	50,329	51,422	50,256	48,846
Average number of diluted common shares outstanding (in shares)	50,329	51,545	50,256	48,987
Basic earnings/(loss) per common share:
Continuing operations (in dollars per share)	$ 0.46	$ 0.40	$ (10.58)	$ 1.41
Discontinued operations (in dollars per share)	(0.04)	0.04	(0.32)	0.06
Total (in dollars per share)	0.42	0.44	(10.90)	1.47
Diluted earnings/(loss) per common share:
Continuing operations (in dollars per share)	0.46	0.40	(10.58)	1.40
Discontinued operations (in dollars per share)	(0.04)	0.04	(0.32)	0.06
Total (in dollars per share)	$ 0.42	$ 0.44	$ (10.90)	$ 1.46
Unvested stock award shares
Earnings per share
Plus: dilutive effect of share-based payment arrangements (in shares)	0	87	0	109
Stock options
Earnings per share
Plus: dilutive effect of share-based payment arrangements (in shares)	0	36	0	32