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Basis of Presentation - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Ownership interest in subsidiaries 100.00%  
Assets of TRSs $ 40,150 $ 26,676
Liabilities of TRSs $ 139,276 $ 101,602