Annual report pursuant to Section 13 and 15(d)

Nature of Operations And Accounting Policies (Summary of Contract Liabilities) (Details)

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Nature of Operations And Accounting Policies (Summary of Contract Liabilities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Change in Contract with Customer, Liability [Roll Forward]    
Balance at beginning of period $ 968 $ 983
Previously deferred revenues recognized upon completion of performance obligations during the period (968) (983)
Net contract liabilities arising during the period 794 968
Balance at end of period $ 794 $ 968