SHAREHOLDERS EQUITY - Stock based compensation - Share Awards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Stock surrendered (in shares)	6,313
Stock surrendered to cover employee withholding taxes | $	$ 0.2
Time Vesting Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of year	179,990
Granted (in shares)	42,442
Vested (in shares)	(23,282)
Forfeited (in shares)	(14,781)
Outstanding at end of year	184,369
Stock issued (in shares)	16,969
Financial Performance Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of year	20,840
Granted (in shares)	250
Forfeited (in shares)	(5,158)
Outstanding at end of year	15,932
Market Performance Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of year	21,467
Granted (in shares)	250
Forfeited (in shares)	(4,459)
Outstanding at end of year	17,258