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Stock-Based Compensation (Details) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Dec. 31, 2018
Second Amended and Restated 2004 Stock Incentive Plan |  |  |
Stock-based compensation |  |  |
Vesting period | 3 years |  |
Second Amended and Restated 2004 Stock Incentive Plan | Restricted Stock and Deferred Shares |  |  |
Stock-based compensation |  |  |
Granted (in shares) | 89,053 | 115,422 |
Second Amended and Restated 2004 Stock Incentive Plan | Performance stock units |  |  |
Stock-based compensation |  |  |
Vesting period | 3 years |  |
Granted (in shares) | 82,898 | 94,215 |
Management Stock Purchase Plan | Maximum |  |  |
Stock-based compensation |  |  |
Percentage of annual incentive bonus that may be used to purchase RSU's | 50.00% |  |
Management Stock Purchase Plan | Class A |  |  |
Stock-based compensation |  |  |
Purchase price as percentage of fair market value of common stock on grant date | 80.00% |  |
Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |
Stock-based compensation |  |  |
Granted (in shares) | 37,486 | 36,208 |
Fair value assumptions |  |  |
Expected life (years) | 3 years |  | 3 years
Expected stock price volatility (as a percent) | 23.30% |  | 24.10%
Expected dividend yield (as a percent) | 1.10% |  | 1.00%
Risk-free interest rate (as a percent) | 2.50% |  | 2.40%
Weighted average grant-date fair value (in dollars per share) | $ 22.16 | $ 21.80 |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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