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Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accounting Policies [Abstract]    
Allowance for doubtful accounts, beginning balance $ (1,919) $ (1,597)
Additions (492) 138
Recoveries (44) (241)
Write-offs 308 17
Allowance for doubtful accounts, ending balance $ (2,147) $ (1,683)