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Fair Value Measurements (Narratives) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Nonrecurring basis | Level 3 |  |
Valuation of our interest rate swaps and impaired assets |  |
Impaired long-lived assets | $ 1.2 | $ 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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