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Stock-Based Compensation - RSUs Outstanding (Details) - $ / shares shares in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2016 | Oct. 02, 2016 | Jul. 03, 2016 | Apr. 03, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |
Dividends distributed on the company's Common Stock (in dollars per share) | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.17 | $ 0.75 | $ 0.71 | $ 0.66 |
Class A |  |  |  |  |  |  |  |  |  |  |  |
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |
Dividends distributed on the company's Common Stock (in dollars per share) |  |  |  |  |  |  |  |  | 0.75 | 0.71 | 0.66 |
Class B |  |  |  |  |  |  |  |  |  |  |  |
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |
Dividends distributed on the company's Common Stock (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.75 | $ 0.71 | $ 0.66 |
Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
RSUs Outstanding |  |  |  |  |  |  |  |  |  |  |  |
Number Outstanding (in shares) | 174 |  |  |  | 148 |  |  |  | 174 | 148 | 101 | 80
Weighted Average Purchase Price (in dollars per share) | $ 39.68 |  |  |  | $ 36.37 |  |  |  | $ 39.68 | $ 36.37 | $ 36.14 | $ 32.08
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |
Number Vested (in shares) | 57 |  |  |  | 28 |  |  |  | 57 | 28 | 25 |
Weighted Average Purchase Price (in dollars per share) | $ 36.26 |  |  |  | $ 37.78 |  |  |  | $ 36.26 | $ 37.78 | $ 33.35 |
$31.63-$35.41 | Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Information about RSUs outstanding |  |  |  |  |  |  |  |  |  |  |  |
Low end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  | 31.63 |  |  |
High end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  | $ 35.41 |  |  |
RSUs Outstanding |  |  |  |  |  |  |  |  |  |  |  |
Number Outstanding (in shares) | 85 |  |  |  |  |  |  |  | 85 |  |  |
Weighted Average Purchase Price (in dollars per share) | $ 35.37 |  |  |  |  |  |  |  | $ 35.37 |  |  |
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |
Number Vested (in shares) | 28 |  |  |  |  |  |  |  | 28 |  |  |
Weighted Average Purchase Price (in dollars per share) | $ 35.30 |  |  |  |  |  |  |  | $ 35.30 |  |  |
$37.13-$49.92 | Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Information about RSUs outstanding |  |  |  |  |  |  |  |  |  |  |  |
Low end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  | 37.13 |  |  |
High end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  | $ 49.92 |  |  |
RSUs Outstanding |  |  |  |  |  |  |  |  |  |  |  |
Number Outstanding (in shares) | 89 |  |  |  |  |  |  |  | 89 |  |  |
Weighted Average Purchase Price (in dollars per share) | $ 43.75 |  |  |  |  |  |  |  | $ 43.75 |  |  |
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |
Number Vested (in shares) | 29 |  |  |  |  |  |  |  | 29 |  |  |
Weighted Average Purchase Price (in dollars per share) | $ 37.21 |  |  |  |  |  |  |  | $ 37.21 |  |  |

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