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Basis of Presentation (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Basis of Presentation    
Ownership interest in subsidiaries (as a percent) 100.00%  
Assets of TRSs $ 38,678 $ 26,559
Liabilities of TRSs $ 91,378 $ 68,921