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Organization and Principles of Consolidation Variable Interest Entities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]    
Document Period End Date Jun. 30, 2017  
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities $ 9,774 $ 8,175
Noncontrolling Interest in Variable Interest Entity 17,691 17,565
Real Estate [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 92,341 86,440
Cash and Cash Equivalents [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 2,957 $ 3,444