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EARNINGS PER COMMON SHARE - Computations for Basic and Diluted Earnings/(Loss) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Earnings Per Share [Line Items]                      
Income from continuing operations $ 10,852 $ 18,108 $ 15,138 $ 9,376 $ 24,495 $ 25,179 $ 19,760 $ 17,306 $ 53,474 $ 86,740 $ 41,118
Less: income allocated to participating securities                 (311) (2,274) (1,310)
Less: participating securities dividends                 (811) (759) (713)
Less: preferred stock dividends (5,113) (5,112) (5,113) (5,113) (5,113) (5,112) (5,114) (4,575) (20,451) (19,914) (9,823)
Income from continuing operations allocated to common stockholders                 31,901 63,793 29,272
Income (loss) from discontinued operations 450 (1,159) (2,881) 7,825 8,769 10,758 6,768 2,381 4,235 28,676 20,954
Net income allocated to common stockholders $ 6,189 $ 11,837 $ 7,144 $ 12,088 $ 28,151 $ 30,825 $ 21,414 $ 15,112 $ 36,136 $ 92,469 $ 50,226
Weighted-average common shares outstanding (shares)                 50,254,595 46,828,463 37,046,594
Add: Dilutive effects of warrants (shares)                 332,806 394,086 383,255
Average shares and dilutive common shares (shares)                 50,819,790 47,638,105 37,598,509
Basic earnings per common share                      
Income from continuing operations (in dollars per share)                 $ 0.64 $ 1.36 $ 0.79
Income from discontinued operations (in dollars per share)                 0.08 0.61 0.57
Net income (in dollars per share)                 0.72 1.97 1.36
Diluted earnings per common share                      
Income from continuing operations (in dollars per share)                 0.63 1.34 0.78
Income from discontinued operations (in dollars per share)                 0.08 0.60 0.56
Net income (in dollars per share)                 $ 0.71 $ 1.94 $ 1.34
Class A Common Stock                      
Schedule of Earnings Per Share [Line Items]                      
Income from continuing operations                 $ 53,136 $ 86,500 $ 41,103
Less: income allocated to participating securities                 (309) (2,268) (1,310)
Less: participating securities dividends                 (806) (757) (713)
Less: preferred stock dividends                 (20,322) (19,859) (9,820)
Income from continuing operations allocated to common stockholders                 31,699 63,616 29,260
Income (loss) from discontinued operations                 4,208 28,597 20,947
Net income allocated to common stockholders                 $ 35,907 $ 92,213 $ 50,207
Weighted-average common shares outstanding (shares)                 49,936,627 46,699,050 37,033,725
Add: Dilutive effects of warrants (shares)                 332,806 394,086 383,255
Average shares and dilutive common shares (shares)                 50,501,822 47,508,692 37,585,640
Basic earnings per common share                      
Income from continuing operations (in dollars per share) $ 0.11 $ 0.25 $ 0.20 $ 0.08 $ 0.37 $ 0.38 $ 0.30 $ 0.30 $ 0.64 $ 1.36 $ 0.79
Income from discontinued operations (in dollars per share) 0.01 (0.02) (0.06) 0.15 0.18 0.22 0.14 0.06 0.08 0.61 0.57
Net income (in dollars per share) 0.12 0.23 0.14 0.23 0.55 0.60 0.44 0.36 0.72 1.97 1.36
Diluted earnings per common share                      
Income from continuing operations (in dollars per share) 0.11 0.25 0.20 0.08 0.36 0.38 0.29 0.30 0.63 1.34 0.78
Income from discontinued operations (in dollars per share) 0.01 (0.02) (0.06) 0.15 0.18 0.21 0.14 0.06 0.08 0.60 0.56
Net income (in dollars per share) 0.12 0.23 0.14 0.23 0.54 0.59 0.43 0.36 $ 0.71 $ 1.94 $ 1.34
Class B Common Stock                      
Schedule of Earnings Per Share [Line Items]                      
Income from continuing operations                 $ 338 $ 240 $ 15
Less: income allocated to participating securities                 (2) (6) 0
Less: participating securities dividends                 (5) (2) 0
Less: preferred stock dividends                 (129) (55) (3)
Income from continuing operations allocated to common stockholders                 202 177 12
Income (loss) from discontinued operations                 27 79 7
Net income allocated to common stockholders                 $ 229 $ 256 $ 19
Weighted-average common shares outstanding (shares)                 317,968 129,413 12,869
Add: Dilutive effects of warrants (shares)                 0 0 0
Average shares and dilutive common shares (shares)                 317,968 129,413 12,869
Basic earnings per common share                      
Income from continuing operations (in dollars per share) 0.11 0.25 0.20 0.08 0.37 0.38 0.30 0.30 $ 0.64 $ 1.36 $ 0.79
Income from discontinued operations (in dollars per share) 0.01 (0.02) (0.06) 0.15 0.18 0.22 0.14 0.06 0.08 0.61 0.57
Net income (in dollars per share) 0.12 0.23 0.14 0.23 0.55 0.60 0.44 0.36 0.72 1.97 1.36
Diluted earnings per common share                      
Income from continuing operations (in dollars per share) 0.11 0.25 0.20 0.08 0.37 0.38 0.30 0.30 0.64 1.36 0.79
Income from discontinued operations (in dollars per share) 0.01 (0.02) (0.06) 0.15 0.18 0.22 0.14 0.06 0.08 0.61 0.57
Net income (in dollars per share) $ 0.12 $ 0.23 $ 0.14 $ 0.23 $ 0.55 $ 0.60 $ 0.44 $ 0.36 $ 0.72 $ 1.97 $ 1.36
Restricted Stock Units                      
Schedule of Earnings Per Share [Line Items]                      
Add: Dilutive effects of restricted stock units and stock options (shares)                 72,655 218,121 138,646
Restricted Stock Units | Class A Common Stock                      
Schedule of Earnings Per Share [Line Items]                      
Add: Dilutive effects of restricted stock units and stock options (shares)                 72,655 218,121 138,646
Restricted Stock Units | Class B Common Stock                      
Schedule of Earnings Per Share [Line Items]                      
Add: Dilutive effects of restricted stock units and stock options (shares)                 0 0 0
Stock Option                      
Schedule of Earnings Per Share [Line Items]                      
Add: Dilutive effects of restricted stock units and stock options (shares)                 159,734 197,435 30,014
Stock Option | Class A Common Stock                      
Schedule of Earnings Per Share [Line Items]                      
Add: Dilutive effects of restricted stock units and stock options (shares)                 159,734 197,435 30,014
Stock Option | Class B Common Stock                      
Schedule of Earnings Per Share [Line Items]                      
Add: Dilutive effects of restricted stock units and stock options (shares)                 0 0 0