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)
12 Months Ended
Dec. 31, 2019
$400 Million 4.875% 2024 Senior Notes [Member] | Debt Instrument, Redemption, Period One, Upon Equity Issuance  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 104.875%
Restricted Amount (percent of original aggregate principal) 35.00%
$400 Million 4.875% 2024 Senior Notes [Member] | Debt Instrument, Redemption, Period One, Including Premium  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 100.00%
$400 Million 4.875% 2024 Senior Notes [Member] | Debt Instrument, Redemption, Period One  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 103.00%
Restricted Amount (percent of original aggregate principal) 10.00%
$400 Million 4.875% 2024 Senior Notes [Member] | Debt Instrument, Redemption, Period Two  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 102.438%
$400 Million 4.875% 2024 Senior Notes [Member] | Debt Instrument, Redemption, Period Three  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 101.219%
$400 Million 4.875% 2024 Senior Notes [Member] | Debt Instrument, Redemption, Period Four  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 100.00%
$750 Million 5.875% 2027 Senior Notes [Member] | Debt Instrument, Redemption, Period One, Upon Equity Issuance  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 105.875%
Restricted Amount (percent of original aggregate principal) 35.00%
$750 Million 5.875% 2027 Senior Notes [Member] | Debt Instrument, Redemption, Period One, Including Premium  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 100.00%
$750 Million 5.875% 2027 Senior Notes [Member] | Debt Instrument, Redemption, Period Two  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 102.938%
$750 Million 5.875% 2027 Senior Notes [Member] | Debt Instrument, Redemption, Period Three  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 101.958%
$750 Million 5.875% 2027 Senior Notes [Member] | Debt Instrument, Redemption, Period Four  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 100.979%
$750 Million 5.875% 2027 Senior Notes [Member] | Debt Instrument, Redemption, Period Five [Member]  
Debt Instrument, Redemption [Line Items]  
Redemption Price1 100.00%