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Summary of Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Summary of Significant Accounting Policies [Line Items]        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent     $ 114,700 $ 46,200
Minimum fiscal year period in days     364 days  
Maximum fiscal year period in days     371 days  
Fiscal quarter period in days 91 days 91 days    
Fiscal Year to Date in Days     273 days 273 days
Basic:        
Net income $ 7,761 $ 28,694 $ 22,739 $ 61,772
Shares (in shares) 164,735,000 164,653,000 164,734,000 164,574,000
Per Share (in usd per share) $ 0.05 $ 0.17 $ 0.14 $ 0.38
Effect of dilutive securities: [Abstract]        
Add: Option shares in the money and dilutive effect of non-vested stock (in shares) 4,759,000 1,717,000 3,645,000 1,222,000
Less: Pro forma treasury shares (in shares) (2,313,000) (934,000) (1,751,000) (642,000)
Diluted:        
Net Income $ 7,761 $ 28,694 $ 22,739 $ 61,772
Shares (in shares) 167,181,000 165,436,000 166,628,000 165,154,000
Per Share (in usd per share) $ 0.05 $ 0.17 $ 0.14 $ 0.37
Stock Options [Member]        
Antidilutive Securities [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 212,525 1,228,334 723,052 1,122,165
Non Vested Stock [Member]        
Antidilutive Securities [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 437,897 887,413 650,758 812,780