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Income Taxes - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2010
Income Taxes
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
Income Taxes
Operating loss carryforwards subject to limitation ofuse	$ 484.5		$ 929.4
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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Operating Loss Carryforwards, Limitations On Use, Amount Subject To Limitation

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- Definition

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

+ 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 (e)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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