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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract]      
Goodwill, Impairment Loss $ 1,000,000 $ 0 $ 3,045,000
Accretion (Amortization) of Discounts and Premiums, Investments 983,000 1,234,000  
Cash Equivalents, at Carrying Value $ 58,436,000 $ 3,309,000  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 9,000 374,000 26,000
Advertising Expense $ 19,629,000 $ 16,024,000 $ 14,892,000
Shipping, Handling and Transportation Costs $ 32,395,000 27,079,000 24,176,000
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 Cost (Reversal of Cost) $ 1,819 $ 1,633,000 $ 1,602,000