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Debt (Terms of The Senior Credit Agreement) (Narrative) (Details) - Senior Credit Agreement [Member]
 12 Months Ended
Dec. 31, 2018
item
Debt Instrument [Line Items]  
Debt to annualized borrower EBITDA ratio 6.5
Debt and net hedge exposure to annualized borrower EBITDA 6.5
Consecutive trading days 30
Annualized borrower EBITDA to annualized cash interest expense 2.0