STOCK-BASED COMPENSATION - Rollfoward (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized, share-based awards other than options. beginning balance	$ 3,877
Equity grants	3,207
Equity grant forfeitures	(49)
Equity compensation expense	(3,967)
Compensation not yet recognized, share-based awards other than options, ending balance	3,068
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized, share-based awards other than options. beginning balance	523
Equity grants	415
Equity grant forfeitures	0
Equity compensation expense	(750)
Compensation not yet recognized, share-based awards other than options, ending balance	188
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized, share-based awards other than options. beginning balance	1,052
Equity grants	1,612
Equity grant forfeitures	(49)
Equity compensation expense	(1,346)
Compensation not yet recognized, share-based awards other than options, ending balance	1,269
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized, share-based awards other than options. beginning balance	2,302
Equity grants	1,180
Equity grant forfeitures	0
Equity compensation expense	(1,871)
Compensation not yet recognized, share-based awards other than options, ending balance	$ 1,611