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Other Assets (Narrative) (Details)
$ in Thousands
Jan. 31, 2012
USD ($)
loan
Jan. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Deferred financing costs       $ 300 $ 200
Note receivable       $ 200 $ 200
Notes Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Principal amount $ 300 $ 300 $ 300    
Number of promissory notes | loan 2        
Accrued interest rate (in percent)   4.50% 4.50%