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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

X

- Definition

The amount of ad valorem tax expense (benefit) included as a component of cost of goods sold (excluding depreciation and amortization).

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- Definition

The amount of ad valorem tax expense (benefit) agreed to by one or more appraisal review boards and/or county appraisal districts.

+ References

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- Definition

The amount of ad valorem tax expense (benefit) in litigation in various courts.

+ References

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- Definition

The balance of indemnified liabilities as of the balance sheet date.

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- Definition

Loss Contingency, Claims Appealed, Number

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- Definition

Number of Petitions

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- Definition

The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of claims settled.

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- Definition

Number of pending claims pertaining to a loss contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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