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Debt - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands, shares in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 06, 2017 USD ($) item $ / shares shares | Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt |  |  |
Repayments of Lines of Credit |  | $ 72,500 | $ 5,000
Credit Facility |  |  |
Debt |  |  |
Repayments of Lines of Credit | $ 72,500 |  |
1.375% Convertible Senior Notes |  |  |
Debt |  |  |
Principal amount | $ 400,000 |  |
Semi-annual interest rate | 1.375% |  |
Conversion rate, shares per $1,000 principal | 10.7744 |  |
Number of shares of common stock | shares | 4.3 |  |
Initial conversion price | $ / shares | $ 92.81 |  |
Number of trading days within 30 trading day period | item | 20 |  |
Number of consecutive trading days | item | 30 |  |
Minimum amount the sales price of the Company's stock exceeds the conversion price (as a percent) | 130.00% |  |
Number of consecutive business days after the 10 consecutive trading day period | 5 days |  |
Number of consecutive trading days before the five consecutive business days | 10 days |  |
Maximum amount the sales price of the Company's stock exceeds the conversion price (as a percent) | 98.00% |  |
Debt issuance costs | $ 10,600 |  |

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