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Employee Benefit Plan (Narrative) (Details) - USD ($)	12 Months Ended
Employee Benefit Plan (Narrative) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Benefit Plan [Abstract]
Defined Contribution Plan Maximum Annual Contributions Per Employee Amount	$ 19,000
Defined Contribution Plan Cost Recognized	$ 923,000	$ 856,000	$ 836,000
Defined Contribution Plan Employer Matching Contribution Percent Of Match	4.00%
Defined Contribution Plan, Years Of Service For Vesting	3 years