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Summary Of Significant Accounting Policies (Schedule Of Diluted Earnings Per Share Computed Using Weighted Average Common And Potentially Dilutive Common Equivalent Shares Outstanding) (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]                      
Weighted average shares outstanding used to compute basic earnings per share 32,335,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,319,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,312,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,242,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,222,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,201,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,187,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,076,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,302,108us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,171,751us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,032,343us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares attributable to stock options and restricted stock                 251,746us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 427,528us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 160,233us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Shares used to compute diluted earnings per share 32,449,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,507,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,641,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,621,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,622,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,658,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,635,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,480,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,553,854us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,599,279us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,192,576us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding