Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES (Debt Redemption) (Details)

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DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES (Debt Redemption) (Details) - $400 Million 4.875% 2024 Senior Notes [Member]
 12 Months Ended
Dec. 31, 2018
Prior to January 15, 2021 - upon equity issuance  
Debt Instrument, Redemption [Line Items]  
Redemption Price 104.875%
Restricted Amount (percent of original aggregate principal) 35.00%
Prior to January 15, 2021, including premium  
Debt Instrument, Redemption [Line Items]  
Redemption Price 100.00%
Prior to January 15, 2021  
Debt Instrument, Redemption [Line Items]  
Redemption Price 103.00%
Restricted Amount (percent of original aggregate principal) 10.00%
Beginning on January 15, 2021  
Debt Instrument, Redemption [Line Items]  
Redemption Price 102.438%
Beginning on January 15, 2022  
Debt Instrument, Redemption [Line Items]  
Redemption Price 101.219%
Beginning on January 15, 2023  
Debt Instrument, Redemption [Line Items]  
Redemption Price 100.00%