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Unconsolidated Joint Ventures - Additional Disclosures (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 29, 2015
USD ($)
Sep. 30, 2015
USD ($)
investment
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
investment
Sep. 30, 2014
USD ($)
Dec. 31, 2014
investment
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Unrealized Intercompany Profit (Loss) Not Eliminated, Amount $ 400          
Number of unconsolidated joint ventures with ownership interests | investment   13   13   12
Management fee revenue, unconsolidated joint ventures   $ 3,255 $ 2,199 $ 8,356 $ 5,524  
Equity in net income of unconsolidated joint ventures $ 1,600 $ 4,056 $ 50 $ 9,180 $ 995  
Minimum [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage   5.00%   5.00%    
Maximum [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage   50.00%   50.00%