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Basis of Presentation (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Ownership interest in subsidiaries 100.00%  
Assets of TRSs $ 34,409 $ 31,917
Liabilities of TRSs $ 135,210 $ 148,459