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Variable Interest Entities Nonconsolidated VIEs (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Variable Interest Entity [Line Items]    
Investment in joint ventures $ 54,694us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 50,876us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Advances to joint ventures 41,816us-gaap_AccountsReceivableRelatedParties 44,869us-gaap_AccountsReceivableRelatedParties
Corporate Joint Venture [Member]    
Variable Interest Entity [Line Items]    
Investment in joint ventures 53,678us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember		 49,860us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Advances to joint ventures 3,293us-gaap_AccountsReceivableRelatedParties
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember		 10us-gaap_AccountsReceivableRelatedParties
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Joint venture, maximum loss exposure $ 105,983us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember		 $ 142,904us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember