Equity (Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Numerator:
Income from continuing operations for purposes of calculating earnings per share	$ 32,502	$ 25,733
Income (loss) from discontinued operations	$ (270)	$ (155)
Denominator:
Weighted average shares outstanding-Basic (in shares)	47,090,830	47,658,995
Effect of dilutive securities:
Stock options and contingently issued restricted stock (in shares)	1,060,554	777,054
Weighted Average Number of Shares Outstanding, Diluted	48,151,384	48,436,049
Basic earnings per share from continuing operations attributable to common shareowners (in dollars per share)	$ 0.69	$ 0.54
Basic earnings (loss) per share from discontinued operations attributable to common shareowners (in dollars per share)	$ (0.01)	$ 0.00
Diluted earnings per share from continuing operations attributable to common shareowners (in dollars per share)	$ 0.67	$ 0.53
Diluted earnings (loss) per share from discontinued operations attributable to common shareowners (in dollars per share)	$ (0.01)	$ 0.00
2.25% Senior convertible debentures
Effect of dilutive securities:
Interest rate on debt (as a percent)	2.25%
Stock options [Member]
Antidilutive securities excluded from computation of earnings per share amount
Antidilutive securities excluded from computation of earnings per share amount (in shares)	609,923	2,684,236
Restricted Stock [Member]
Antidilutive securities excluded from computation of earnings per share amount
Antidilutive securities excluded from computation of earnings per share amount (in shares)	1,188,699	1,149,622