INCOME TAXES NOL and tax credit carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating Loss Carryforwards
Percentage of post 2017 NOLs, deductible	80.00%
State
Operating Loss Carryforwards
Operating loss carryforwards	$ 277.7
State | Minimum
Operating Loss Carryforwards
Expiration date	Jan. 01, 2020
State | Maximum
Operating Loss Carryforwards
Expiration date	Dec. 31, 2039
Foreign
Operating Loss Carryforwards
Operating loss carryforwards	$ 5.9
Expiration date	Dec. 31, 2029
Tax credit carryforward	$ 3.3
Foreign | Minimum
Operating Loss Carryforwards
Expiration date	Jan. 01, 2020
Foreign | Maximum
Operating Loss Carryforwards
Expiration date	Dec. 31, 2027