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Notes Receivable (Schedule of Notes Receivables Concentration by Geographic Area) (Details) (Geographic Concentration Risk, Notes Receivable)
 12 Months Ended
Dec. 31, 2013
Colorado
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Concentration risk, percentage 70.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_NotesReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= stpr_CO
Georgia
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Concentration risk, percentage 29.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_NotesReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= stpr_GA
Texas
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Concentration risk, percentage 1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_NotesReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX