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Unconsolidated Joint Ventures - Additional Disclosures (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 23, 2017
USD ($)
Aug. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
investment
Dec. 31, 2016
USD ($)
investment
Dec. 31, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]                
Equity Method Investments, Number | investment           10 13  
Advances to Affiliate           $ 3,800 $ 4,000  
Debt Instrument, Interest Rate, Stated Percentage           7.25%    
Management fee revenue, unconsolidated joint ventures           $ 4,945 8,202 $ 12,426
Equity method investment, acquisition of partner's interest $ 13,600 $ 2,600     $ 20,600      
Proceeds from (Repayments of) Notes Payable $ 4,110         (4,110) (15,636) (5,171)
Equity in net income of unconsolidated joint ventures           $ 866 $ 7,691 $ 13,767
Minimum [Member]                
Schedule of Equity Method Investments [Line Items]                
Ownership percentage           5.00%    
Maximum [Member]                
Schedule of Equity Method Investments [Line Items]                
Ownership percentage           35.00%    
Gain on Joint Venture Closeout [Member] [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity in net income of unconsolidated joint ventures     $ 300 $ 1,100        
Gain on Fair Value Remeasurement [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity in net income of unconsolidated joint ventures     $ 100 $ 500        
Interest Income on Note to Joint Venture [Member]                
Schedule of Equity Method Investments [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage           10.00%