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Commitments and Contingencies - Legal Proceedings (Details) $ in Millions	Dec. 31, 2016 USD ($)
Denver Settlement | Monetary Damages
Loss Contingencies [Line Items]
Loss contingency accrual	$ 4.0
Derivative Settlement | Legal and Professional Fees
Loss Contingencies [Line Items]
Loss contingency accrual	$ 0.6

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+ References

No definition available.

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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