Financing Agreements (Schedule of Covenants) (Details)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Maximum [Member]
Debt Instrument [Line Items]
Secured Net Leverage Ratio				4.50
Maximum [Member] | Forecast [Member]
Debt Instrument [Line Items]
Secured Net Leverage Ratio	3.00	3.50	4.00
Minimum [Member]
Debt Instrument [Line Items]
Interest Coverage Ratio				3.25
Minimum [Member] | Forecast [Member]
Debt Instrument [Line Items]
Interest Coverage Ratio	4.00	3.75	3.50