Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES - BORROWING CAPACITY (Details)

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DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES - BORROWING CAPACITY (Details) - USD ($)
Dec. 31, 2018
Feb. 28, 2018
Dec. 31, 2017
Mar. 30, 2015
ABL Facility [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Par Value   $ 450,000,000   $ 550,000,000
Revolving credit facility, borrowing capacity $ 323,700,000   $ 273,200,000  
Long-term Line of Credit 0   0  
Line of Credit Facility, Remaining Borrowing Capacity 268,700,000   226,700,000  
Letter of Credit [Member]        
Line of Credit Facility [Line Items]        
Long-term Line of Credit $ (55,000,000)   $ (46,500,000)