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Organization and Principles of Consolidation Variable Interest Entities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]    
Document Period End Date Mar. 31, 2017  
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities $ 9,757 $ 8,175
Noncontrolling Interest in Variable Interest Entity 17,709 17,565
Real Estate [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 89,682 86,440
Cash and Cash Equivalents [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 3,516 $ 3,444