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Commitments and Contingencies - Narratives (Details) $ in Millions | 12 Months Ended | 24 Months Ended | 48 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) case | Dec. 31, 2015 USD ($)
Loss contingency |  |  |  |  |
Rent expense | $ 10.9 | $ 9.8 | $ 9.9 |  |
Accrued liability for the outcomes of non-income based tax audits | 2.7 |  |  | $ 2.7 | $ 2.7
Indemnified liabilities | 1.5 |  |  | $ 1.5 | 1.5
Litigation and Claims |  |  |  |  |
Number of heavy equipment statutes cases tried and completed in Texas state district court (cases) | case |  |  |  | 3 |
Number of heavy equipment statues cases appealed (cases) | case |  |  |  | 3 |
Ad valorem tax benefit | 16.0 |  |  |  | 44.0
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts | 10.2 |  |  | $ 10.2 | 10.2
Ad valorem tax benefit in litigation | $ 33.8 |  |  | $ 33.8 | $ 33.8

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