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Equity (Earnings Per Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Mar. 30, 2013
2.25% Senior convertible debentures
Mar. 31, 2012
2.25% Senior convertible debentures
Dec. 31, 2011
2.25% Senior convertible debentures
Mar. 26, 2011
2.25% Senior convertible debentures
Mar. 30, 2013
Stock options
Mar. 31, 2012
Stock options
Antidilutive securities excluded from computation of earnings per share amount                
Antidilutive securities excluded from computation of earnings per share amount (in shares)             2,684,236 4,395,903
Numerator:                
Income from continuing operations for purposes of calculating earnings per share $ 25,733 $ 26,362            
Income (loss) from discontinued operations $ (155) $ 77            
Denominator:                
Weighted average shares outstanding-Basic (in shares) 47,658,995 48,254,950            
Effect of dilutive securities:                
2.25% senior convertible debentures (in shares) 0 0            
Stock options and contingently issued restricted stock (in shares) 777,054 516,793            
Weighted average shares outstanding-Diluted (in shares) 48,436,049 48,771,743         1,149,622 930,193
Basic earnings per share from continuing operations attributable to common shareowners (in dollars per share) $ 0.54 $ 0.55            
Basic earnings (loss) per share from discontinued operations attributable to common shareowners (in dollars per share) $ 0.00 $ 0.00            
Diluted earnings per share from continuing operations attributable to common shareowners (in dollars per share) $ 0.53 $ 0.54            
Diluted earnings (loss) per share from discontinued operations attributable to common shareowners (in dollars per share) $ 0.00 $ 0.00            
Interest rate on debt (as a percent)     2.25% 2.25% 2.25% 2.25%