|**Net Income Per Common Share (Tables)**   | 3 Months Ended                                                                                                                                                                                                                                                                                                                                       
|------------------------------------------ | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|**Net Income Per Common Share [Abstract]** |                                                                                                                                                                                                                                                                                                                                                      
|Schedule Of Earnings Per Share             | Three Months EndedMarch 31,2014
				
				2013Average common shares outstanding during the period for basic computation
				
				176,839
				
				175,415Dilutive effect of employee stock-based compensation
				
				971
				
				1,084Average common shares outstanding during the period for diluted computation
				
				177,810
				
				176,499
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|                                           | Average common shares outstanding during the period for basic computation                                                                                                                                                                                                                                                                            
|                                           | Dilutive effect of employee stock-based compensation                                                                                                                                                                                                                                                                                                 
|                                           | Average common shares outstanding during the period for diluted computation                                                                                                                                                                                                                                                                          
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