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Income Taxes - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2010
Income Taxes
Federal net operating loss carryforwards subject to the IRC Section 382 limitation			$ 929.4
Unrecognized tax benefits	$ 0.1	$ 0.1
Minimum
Income Taxes
Number of tax years open for state tax audit (in years)	3 years
Maximum
Income Taxes
Number of tax years open for state tax audit (in years)	5 years
Domestic Tax Authority | Earliest Tax Year
Income Taxes
Open tax year	2012
Net Operating Loss And Other Carryforwards | Earliest Tax Year
Income Taxes
Open tax year	2005
Net Operating Loss And Other Carryforwards | Latest Tax Year
Income Taxes
Open tax year	2011

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Income Taxes [Line Items]

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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-Section 50



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-Name Accounting Standards Codification



-Topic 740



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