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Long-Term Debt Interest Rate Swaps (Details) $ in Thousands | 6 Months Ended
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Jun. 27, 2018 USD ($)
Derivative [Line Items] |  |
Interest rate swaps, net liability | $ 1,800 |
Interest rate swaps, asset | 3,300 |
Interest rate swaps, liability | $ 5,200 |
Interest Rate Swap 2018-2025 [Member] |  |
Derivative [Line Items] |  |
Trade date | Mar. 20, 2015 |
Effective date | Mar. 29, 2018 |
Maturity date | Mar. 31, 2025 |
Notional amount | $ 120,000 |
Fixed rate | 2.44% |
Interest Rate Swap 2018-2026 [Member] |  |
Derivative [Line Items] |  |
Trade date | Oct. 01, 2015 |
Effective date | Mar. 29, 2018 |
Maturity date | Mar. 31, 2026 |
Notional amount | $ 50,000 |
Fixed rate | 2.46% |
Interest Rate Swap 2020-2033 [Member] |  |
Derivative [Line Items] |  |
Trade date | Feb. 15, 2018 |
Effective date | Mar. 31, 2020 |
Maturity date | Dec. 31, 2033 |
Notional amount | $ 80,000 | [1]
Fixed rate | 3.19% |
Interest Rate Swap 2020-2033 [Member] | Maximum [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 425,000 |
[1] | The notional amount of the swaps entered into on February 15, 2018 increases annually beginning September 30, 2020 until they reach the maximum notional amount of $425.0 million on September 28, 2029.

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