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Shareholders' Equity Shareholders' Equity (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Accumulated other comprehensive loss, net of tax, beginning balance $ (23,777) $ (24,602) $ (16,842)
Benefit obligation actuarial gain (loss) (73) 5,737 (12,611)
Net gain (loss) (342) (3,894) 1,248
Amortization of net loss [1] 85 1,812 990
Settlement loss recognized 24,297 0 0
Net change in fair value of derivatives 1,693 (1,444) (2,389)
Reclassification of derivatives to interest expense [2] (789) (859)  
Income tax benefit (expense) (2,501) (527) 4,952
Accumulated other comprehensive loss, net of tax, ending balance (1,407) (23,777) (24,602)
Estimated reclassification from other comprehensive income to interest expense related to the interest rate swaps over the next 12 months 700    
Pensions [Member]      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Accumulated other comprehensive loss, net of tax, beginning balance (22,764) (24,994) (18,690)
Benefit obligation actuarial gain (loss) (73) 5,737 (12,611)
Net gain (loss) (342) (3,894) 1,248
Amortization of net loss [1] 85 1,812 990
Settlement loss recognized 24,297    
Income tax benefit (expense) (2,148) (1,425) 4,019
Accumulated other comprehensive loss, net of tax, ending balance (945) (22,764) (24,994)
Derivatives [Member]      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Accumulated other comprehensive loss, net of tax, beginning balance (1,013) 392 1,848
Net change in fair value of derivatives 1,693 (1,444) (2,389)
Reclassification of derivatives to interest expense [2] (789) (859)  
Income tax benefit (expense) (353) 898 933
Accumulated other comprehensive loss, net of tax, ending balance (462) (1,013) 392
Other Defined Benefit Plans [Member]      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Settlement loss recognized $ 0 $ 0 50
Other Defined Benefit Plans [Member] | Pensions [Member]      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Settlement loss recognized     $ 50
[1] Before-tax amount that was reclassified from accumulated other comprehensive loss and included as a component of pension expense within general and administrative expenses in our Consolidated Statements of Income. See Note 11 for additional details.
[2] Amounts reclassified from accumulated other comprehensive loss into income, represent payments made to the counterparty for the effective portions of the interest rate swaps. These amounts are included as a component of interest expense in our Consolidated Statements of Income. We expect to reclassify approximately $0.7 million from accumulated other comprehensive loss related to our interest rate swaps during the next twelve months. See Note 10 for additional details.