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Quarterly Financial Data (unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2013
Mar. 31, 2014
Dec. 31, 2013
Oct. 01, 2013
Jul. 02, 2013
Apr. 02, 2013
Jan. 01, 2013
Oct. 02, 2012
Jul. 03, 2012
Apr. 03, 2012
Dec. 31, 2013
Jan. 01, 2013
Jan. 03, 2012
Quarterly Financial Data (unaudited)                          
Revenues     $ 475,075 $ 469,699 $ 470,118 $ 463,018 $ 464,695 $ 453,819 $ 454,749 $ 435,754 $ 1,877,910 $ 1,809,017 $ 1,757,624
Income/(loss) from operations     44,366 38,631 41,170 36,787 28,186 39,324 40,970 30,219 160,954 138,699 133,450
Net income/(loss)     33,000 27,481 28,583 25,292 22,139 27,163 28,399 20,722 114,356 98,423 95,720
Basic net income per share (in dollars per share)     $ 0.64 $ 0.52 $ 0.54 $ 0.48 $ 0.42 $ 0.51 $ 0.53 $ 0.39 $ 2.19 $ 1.85 $ 1.70
Diluted net income per share (in dollars per share)     $ 0.62 $ 0.50 $ 0.52 $ 0.47 $ 0.40 $ 0.49 $ 0.52 $ 0.37 $ 2.10 $ 1.78 $ 1.64
Cash dividends declared per common share (in dollars per share) $ 0.14 $ 0.14 $ 0.14 $ 0.14 $ 0.12 $ 0.12 $ 0.12 $ 0.12     $ 0.52 $ 0.24  
Proceeds from a variable life insurance contract                 $ 419