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Notes Payable - Minimum Future Payments Due on Notes Payable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
2015 $ 18,323us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear  
2016 138,199us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 62,195us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 328,320us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 152,885us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter 215,081us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total $ 915,003us-gaap_DebtInstrumentCarryingAmount $ 882,988us-gaap_DebtInstrumentCarryingAmount