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Summary of Significant Accounting Policies (Schedule of Weighted Average Number of Shares) (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract]      
Basic weighted-average Common Shares outstanding 28,402,227 28,082,114 27,763,990
Effect of dilutive shares 677,599 689,531 544,932
Diluted weighted-average Common Shares outstanding 29,079,826 28,771,645 28,308,922