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Fair Value of Financial Instruments (Narrative) (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Assets measured on a nonrecurring basis $ 0 $ 0  
Liabilities measured on a nonrecurring basis 0 $ 0  
Maximum [Member]      
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 1,000,000   $ 1,000,000
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 1,000,000   1,000,000
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 1,000,000   1,000,000
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount $ 1,000,000   $ 1,000,000