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INCOME TAXES - OPERATING LOSS AND TAX CREDIT CARRYFORWARDS (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Operating Loss and Tax Credit Carryforwards    
Alternative minimum tax credit carryforwards $ 5.9 $ 4.2
Valuation allowances 11.5 13.0
U.S. Federal Income Tax    
Operating Loss and Tax Credit Carryforwards    
Net operating losses carryforwards 74.5 183.8
State Income Tax    
Operating Loss and Tax Credit Carryforwards    
Net operating losses carryforwards 189.2 192.3
Foreign Income Tax    
Operating Loss and Tax Credit Carryforwards    
Net operating losses carryforwards $ 18.4 $ 23.7