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Commitments and Contingencies (Narratives) (Details) $ in Millions | 9 Months Ended | 69 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) claim petition | Sep. 30, 2017 USD ($) claim petition | Dec. 31, 2016 USD ($) 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 | $ | $ 1.7 | $ 1.7 | $ 1.5 |  |  |  |  |
Indemnification liability | $ | 2.0 | 2.0 | $ 1.7 |  |  |  |  |
Litigation and Claims |  |  |  |  |  |  |  |
Ad valorem tax benefit | $ | 12.7 | 73.4 |  |  |  |  |  |
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts | $ | 16.0 | 16.0 |  |  |  |  |  |
Ad valorem tax benefit in litigation | $ | $ 57.4 | $ 57.4 |  |  |  |  |  |
Number of petitions | petition | 83 | 83 | 113 |  | 120 | 115 | 109 | 176
Number of cases appealed | claim | 3 | 3 |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of cases settled | claim | 3 |  |  |  |  |  |  |
Number of pending cases | claim | 5 | 5 |  |  |  |  |  |
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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