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Variable Interest Entities ("VIEs") (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Variable Interest Entity [Line Items]    
Other Liabilities $ 66,079us-gaap_OtherLiabilitiesNoncurrent $ 66,968us-gaap_OtherLiabilitiesNoncurrent
Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Other Liabilities 0us-gaap_OtherLiabilitiesNoncurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Maximum Exposure to Loss $ 339,500us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember