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Investments in Partnerships and LLCs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Noncontrolling Interest [Line Items]      
Investments in unconsolidated entities $ 1,172 $ 17,991  
Noncontrolling Interest in Joint Ventures $ 0 15,600  
Minimum [Member]      
Noncontrolling Interest [Line Items]      
Ownership percentage (percent) 20.00%    
Maximum [Member]      
Noncontrolling Interest [Line Items]      
Parent ownership percentage (percent) 58.00%    
EM 646 [Member]      
Noncontrolling Interest [Line Items]      
Parent ownership percentage (percent) 58.20%    
Distribution Made to Partners, Value of Land Distributed $ 19,900 7,100  
Variable Interest Entity, Not Primary Beneficiary [Member]      
Noncontrolling Interest [Line Items]      
Contributions to unconsolidated entities $ 2,900 $ 3,600 $ 100