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Investments in and Advances to Affiliates Ownership percentages (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Noncontrolling Interest, Ownership Percentage by Parent	50.00%us-gaap_MinorityInterestOwnershipPercentageByParent
Gain on sale of joint venture	$ 0us-gaap_GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee	$ 1.2us-gaap_GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee	$ 0us-gaap_GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee

X

- Definition

Amount of gain (loss) on sale or disposal of equity in securities of subsidiaries or equity method investee.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Subparagraph g

-Article 9



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13(g))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant