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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 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, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share Basic and Diluted [Line Items]                      
Net income from continuing operations $ 32,636 $ 20,659 $ 23,954 $ 24,272 $ 17,068 $ 33,069 $ 33,711 $ 25,371 $ 101,521 $ 109,219 $ 49,116
(Loss)/income from discontinued operations, net of tax (6,885) 1,957 1,494 (637) (2,809) (842) 320 (123) (4,071) (3,454) 6,131
Net income $ 25,751 $ 22,616 $ 25,448 $ 23,635 $ 14,259 $ 32,227 $ 34,031 $ 25,248 $ 97,450 $ 105,765 $ 55,247
Average number of common shares issued (shares)                 49,782 46,212 40,627
Less: average number of treasury shares (shares)                 1,142 810 963
Less: average number of unvested stock award shares (shares)                 420 421 437
Plus: average participating preferred shares (shares)                 1,043 1,043 229
Average number of basic common shares outstanding (shares) 50,494 51,422 48,961 46,113 46,061 46,030 46,032 45,966 49,263 46,024 39,456
Average number of diluted common shares outstanding (shares) 50,702 51,545 49,114 46,261 46,240 46,263 46,215 46,200 49,421 46,231 39,695
Basic earnings/(loss) per share:                      
Continuing operations (USD per share) $ 0.65 $ 0.40 $ 0.49 $ 0.52 $ 0.37 $ 0.72 $ 0.73 $ 0.55 $ 2.06 $ 2.38 $ 1.24
Discontinued operations (USD per share) (0.14) 0.04 0.03 (0.01) (0.06) (0.02) 0.01 0 (0.08) (0.08) 0.16
Basic earnings per common share (USD per share) 0.51 0.44 0.52 0.51 0.31 0.70 0.74 0.55 1.98 2.30 1.40
Diluted earnings/(loss) per share:                      
Continuing Operations (USD per share) 0.65 0.40 0.49 0.52 0.37 0.72 0.73 0.55 2.05 2.36 1.24
Discontinued operations (USD per share) (0.14) 0.04 0.03 (0.01) (0.06) (0.02) 0.01 0 (0.08) (0.07) 0.15
Diluted earnings per common share (USD per share) $ 0.51 $ 0.44 $ 0.52 $ 0.51 $ 0.31 $ 0.70 $ 0.74 $ 0.55 $ 1.97 $ 2.29 $ 1.39
Unvested stock awards                      
Earnings Per Share Basic and Diluted [Line Items]                      
Incremental common shares attributable to dilutive effect of share-based payment arrangements (shares)                 122 180 202
Employee Stock Option                      
Earnings Per Share Basic and Diluted [Line Items]                      
Incremental common shares attributable to dilutive effect of share-based payment arrangements (shares)                 36 27 37