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Basis of Presentation (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Basis of Presentation    
Ownership interest in subsidiaries (as a percent) 100.00%  
Assets of TRSs $ 32,875 $ 27,023
Liabilities of TRSs $ 63,696 $ 50,528