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Investments in Partially Owned Entities - Other - Additional Information (Details) - USD ($)
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]      
Investments in unconsolidated entities $ 59,246,000   $ 60,141,000
Unconsolidated Non-VIE      
Variable Interest Entity [Line Items]      
Investments in unconsolidated entities 0    
Unconsolidated Non-VIE | Residual JV [Member]      
Variable Interest Entity [Line Items]      
Investments in unconsolidated entities $ 700,000    
Joint venture ownership percentage owned by company 60.00%    
Joint Venture Partner Ownership Percentage 40.00%    
Unconsolidated Non-VIE | Legacy JV [Member]      
Variable Interest Entity [Line Items]      
Joint venture ownership percentage owned by company 60.00%    
Joint Venture Partner Ownership Percentage 40.00%    
Liquidation Value Preferred Interests $ 39,500,000    
Private Equity Fund | Capital Commitment      
Variable Interest Entity [Line Items]      
Investments in unconsolidated entities $ 900,000    
Private Equity Fund | Maximum [Member]      
Variable Interest Entity [Line Items]      
Investments in unconsolidated entities   $ 5,000,000