Earnings (Loss) 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]	6 Months Ended
	Jul. 01, 2016 $ / shares shares
$36.75 [Member]
Share price | $ / shares	$ 36.75
Incremental common shares attributable to contingently issuable shares	0
$36.75 [Member] | Total Treasury Method Incremental Shares [Member]
Incremental common shares attributable to contingently issuable shares	0
$38.75 [Member]
Share price | $ / shares	$ 38.75
Incremental common shares attributable to contingently issuable shares	603,152
$38.75 [Member] | Total Treasury Method Incremental Shares [Member]
Incremental common shares attributable to contingently issuable shares	603,152
$40.75 [Member]
Share price | $ / shares	$ 40.75
Incremental common shares attributable to contingently issuable shares	1,147,099
$40.75 [Member] | Total Treasury Method Incremental Shares [Member]
Incremental common shares attributable to contingently issuable shares	1,147,099
$42.75 [Member]
Share price | $ / shares	$ 42.75
Incremental common shares attributable to contingently issuable shares	1,640,151
$42.75 [Member] | Total Treasury Method Incremental Shares [Member]
Incremental common shares attributable to contingently issuable shares	1,640,151
$44.75 [Member]
Share price | $ / shares	$ 44.75
Incremental common shares attributable to contingently issuable shares	2,089,131
$44.75 [Member] | Total Treasury Method Incremental Shares [Member]
Incremental common shares attributable to contingently issuable shares	2,089,131