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Fair Value Measurements (Narrative) (Details)
Jun. 30, 2019
USD ($)
Fair Value Measurements [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount $ 0