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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]      
Goodwill, Impairment Loss $ 0 $ 3,045,000 $ 0
Accretion (Amortization) of Discounts and Premiums, Investments 1,234,000 1,375,000  
Cash Equivalents, at Carrying Value $ 3,309,000 $ 2,242,000  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 374,000 26,000 290,000
Advertising Expense $ 16,024,000 $ 14,892,000 $ 13,872,000
Shipping, Handling and Transportation Costs $ 27,079,000 24,176,000 21,030,000
Defined Benefit Plan Matching Contribution Percentage Of Employees Contributions 50.00%    
Defined Benefit Plan Maximum Percentage To Be Matched Of Employees Compensation 6.00%    
Pension Expense $ 1,633 $ 1,602,000 $ 1,450,000