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Earnings Per Common Share (Impact Of Company's Stock Price On Assuming Dilution Calculation For The Subordinated Convertible Notes) (Details) - Subordinated Convertible Notes Due 2029 [Member]
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Share Price (in dollars per share) | $ / shares $ 36.75
$36.75 [Member]  
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Share Price (in dollars per share) | $ / shares $ 36.75
Incremental common shares attributable to contingently issuable shares (in shares) 0
$36.75 [Member] | Total Treasury Method Incremental Shares [Member]  
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Incremental common shares attributable to contingently issuable shares (in shares) 0
$38.75 [Member]  
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Share Price (in dollars per share) | $ / shares $ 38.75
Incremental common shares attributable to contingently issuable shares (in shares) 603,152
$38.75 [Member] | Total Treasury Method Incremental Shares [Member]  
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Incremental common shares attributable to contingently issuable shares (in shares) 603,152
$40.75 [Member]  
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Share Price (in dollars per share) | $ / shares $ 40.75
Incremental common shares attributable to contingently issuable shares (in shares) 1,147,099
$40.75 [Member] | Total Treasury Method Incremental Shares [Member]  
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Incremental common shares attributable to contingently issuable shares (in shares) 1,147,099
$42.75 [Member]  
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Share Price (in dollars per share) | $ / shares $ 42.75
Incremental common shares attributable to contingently issuable shares (in shares) 1,640,151
$42.75 [Member] | Total Treasury Method Incremental Shares [Member]  
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Incremental common shares attributable to contingently issuable shares (in shares) 1,640,151
$44.75 [Member]  
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Share Price (in dollars per share) | $ / shares $ 44.75
Incremental common shares attributable to contingently issuable shares (in shares) 2,089,131
$44.75 [Member] | Total Treasury Method Incremental Shares [Member]  
Changes In Company Stock Price Inclusion Of Additional Shares [Line Items]  
Incremental common shares attributable to contingently issuable shares (in shares) 2,089,131