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Fair Value Measurements (Fair Value, Assets Measured on Recurring Basis) (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents and restricted cash equivalents $ 4,303 $ 4,580
Restricted certificates of deposit 3,855 3,769
Escrow receivable 930 930
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents and restricted cash equivalents 4,303 4,580
Restricted certificates of deposit 3,855 3,769
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Escrow receivable $ 930 $ 930