SHAREHOLDERS' EQUITY - Restricted Stock Awards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense			$ 0.1
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	81,846
2010 Long-term Stock Incentive Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	$ 2.4	$ 1.6	1.9
2010 Long-term Stock Incentive Plan | Restricted Stock | 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)						50,000
Restricted stock outstanding (in shares)	10,000
Compensation Expense	$ 0.0	0.0	0.0
2010 Long-term Stock Incentive Plan | Restricted Stock | 2017, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)				53,288
Restricted stock outstanding (in shares)	0
Compensation Expense	$ 0.0	0.0	0.0
2010 Long-term Stock Incentive Plan | Restricted Stock | 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)					100,000
Restricted stock outstanding (in shares)	0
Compensation Expense	$ 0.0	0.0	$ 0.1
2010 Long-term Stock Incentive Plan | Restricted Stock | 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)			5,117
Restricted stock outstanding (in shares)	0
Compensation Expense	$ 0.0	0.0	$ 0.0
2010 Long-term Stock Incentive Plan | Restricted Stock | 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)								175,000
Restricted stock outstanding (in shares)	0
Compensation Expense	$ 0.0	0.0	0.1
2010 Long-term Stock Incentive Plan | Restricted Stock | 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)							100,000
Restricted stock outstanding (in shares)	0
Compensation Expense	$ 0.0	0.0	0.2
2010 Long-term Stock Incentive Plan | Restricted Stock | 2017, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)				49,600
Restricted stock outstanding (in shares)	0
Compensation Expense	$ 0.0	$ 0.0
2010 Long-term Stock Incentive Plan | Restricted Stock | 2019, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)		30,251
Restricted stock outstanding (in shares)	24,200
Compensation Expense	$ 0.2	$ 0.3	0.0
2010 Long-term Stock Incentive Plan | Restricted Stock | 2019, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)		149,412
Restricted stock outstanding (in shares)	57,242
Compensation Expense	$ 1.2	$ 1.3	0.0
2010 Long-term Stock Incentive Plan | Restricted Stock | 2020 Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	28,272
Restricted stock outstanding (in shares)	28,272
Compensation Expense	$ 0.4	0.0	0.0
2010 Long-term Stock Incentive Plan | Restricted Stock | 2020 Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	43,330
Restricted stock outstanding (in shares)	26,446
Compensation Expense	$ 0.6	$ 0.0	0.0
Discontinued Operations | 2010 Long-term Stock Incentive Plan | Restricted Stock | 2017, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense			$ 1.5