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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
Operating Loss Carryforwards | $ 86.2 |  |
Earliest Tax Year [Member] |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2027 |  |
Latest Tax Year [Member] |  |  |
Internal Revenue Service income tax examination, year | 2008 |  |
Federal [Member] |  |  |
Income Taxes Paid | $ 27.3 | $ 28.0 | $ 25.0
State [Member] |  |  |
Income Taxes Paid | $ 3.7 | $ 2.2 | $ 1.8
Pennsylvania [Member] | Earliest Tax Year [Member] |  |  |
Open Tax Year | 2012 |  |
Pennsylvania [Member] | Latest Tax Year [Member] |  |  |
Open Tax Year | 2016 |  |

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