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Fair Value Measurements (Narratives) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Nonrecurring basis | Level 3
Valuation of our interest rate swaps and impaired assets
Impaired long-lived assets	$ 1.5	$ 2.6
Impaired long-lived assets
Valuation of our interest rate swaps and impaired assets
Weighted average disposal period of impaired assets	4 years

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