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Commitments and Contingencies (Narratives) (Details) $ in Millions | 6 Months Ended | 78 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) claim | Jun. 30, 2018 USD ($) claim | Dec. 31, 2017 USD ($) petition | Dec. 31, 2016 petition | Sep. 19, 2016 claim | Dec. 31, 2015 petition | Dec. 31, 2014 petition | Dec. 31, 2013 petition | Dec. 31, 2012 petition
Loss contingency |  |  |  |  |  |  |  |  |
Accrued liability for the outcomes of non-income based tax audits | $ | $ 2.5 | $ 2.5 | $ 1.7 |  |  |  |  |  |
Indemnification liability | $ | 1.6 | 1.6 | $ 1.6 |  |  |  |  |  |
Litigation and Claims |  |  |  |  |  |  |  |  |
Ad valorem tax benefit | $ | 9.5 | 87.7 |  |  |  |  |  |  |
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts | $ | 21.4 | 21.4 |  |  |  |  |  |  |
Ad valorem tax benefit in litigation | $ | $ 66.3 | $ 66.3 |  |  |  |  |  |  |
Number of petitions | petition |  |  | 113 | 113 |  | 120 | 115 | 109 | 176
Number of cases appealed | claim | 3 | 3 |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of pending cases | claim | 5 | 5 |  |  |  |  |  |  |
Number of cases settled | claim | 3 |  |  |  |  |  |  |  |
Similar Judge |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of cases settled | claim | 2 |  |  |  |  |  |  |  |
United ISD |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of pending cases | claim | 4 | 4 |  |  | 5 |  |  |  |

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