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Debt (Schedule of Interest Rate Swaps and Details) (Details) - USD ($) | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 29, 2018 | Jun. 30, 2017
Interest Rate Swap 3 [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Term of Contract | 3 years |  |
Derivative Liability, Notional Amount | $ 200,000,000 |  |
Notional Amount |  | $ 200,000,000 |
Pay Fixed Rate |  | 1.1325% |
Receive Current Floating Rate |  | 2.1029% |
Fair Value, Asset |  | $ 5,756,000 |
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized In Income Ineffective Portion |  | 0 | $ 0
Reduction (Increase) to Interest Expense |  | 600,000 | $ (300,000)
Gain expected to be reclassified into earnings within the next twelve months |  | $ 2,500,000 |

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