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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Document Fiscal Year Focus 2015  
Unsecured Credit Facilities [Member] | Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 1.10% 1.30%
Unsecured Credit Facilities [Member] | Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 1.10% 1.30%
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable, Fair Value $ 10,620 $ 11,980
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Payable, Fair Value 1,793,200 2,116,000
Fair Value, Inputs, Level 2 [Member] | Unsecured Credit Facilities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure $ 165,300 $ 75,000
Notes Receivable [Member] | Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 6.30% 7.40%
Notes Receivable [Member] | Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 6.30% 7.40%
Notes Payable, Other Payables [Member] | Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 2.80% 0.90%
Notes Payable, Other Payables [Member] | Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 4.20% 3.40%
Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Liability $ (20,539) $ (18,794)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Liability 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Liability $ (20,539) $ (18,794)