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Employee Benefit Plans Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee Benefit Plans [Line Items] |  |  |  |
Matching contributions recorded in Compensation and related expense |  | $ 5.0 | $ 4.8 | $ 3.9
Other Postretirement Benefits Plan [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  | 4.00% |  |
Number of hours of service for vesting, per year |  | 1,000 |  |
Number of years of service for vesting |  | 2 years |  |
Annual vesting percentage |  | 20.00% |  |
Number of years for incremental percentage vesting until participant fully vested in company's matching contribution |  | 4 years |  |
Other Postretirement Benefits Plan [Member] | First Salary Deferral Contribution [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Employee contribution percentage |  | 2.00% |  |
Other Postretirement Benefits Plan [Member] | Second Salary Deferral Contribution [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Employee contribution percentage |  | 4.00% |  |
Other Postretirement Benefits Plan [Member] | Minimum [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Employee contribution percentage |  | 1.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  | 50.00% |  |
Other Postretirement Benefits Plan [Member] | Maximum [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 50.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  | 100.00% |  |
Employee Stock [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 10.00% |  |
Maximum number of shares of Class B common stock for Employee Stock Purchase Plan |  | 750,000 |  |
Defined Contribution Plan Number Of Shares Of Class B Common Stock Purchased Under Plan During Current Year |  | 8,887 |  |
Defined Contribution Plan Number Of Shares Of Class B Common Stock Purchased Under Plan Since Inception |  | 185,518 |  |
Subsequent Event [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 4.50% |  |  |
Subsequent Event [Member] | Other Postretirement Benefits Plan [Member] | First Salary Deferral Contribution [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Employee contribution percentage | 3.00% |  |  |
Subsequent Event [Member] | Other Postretirement Benefits Plan [Member] | Second Salary Deferral Contribution [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Employee contribution percentage | 3.00% |  |  |
Subsequent Event [Member] | Other Postretirement Benefits Plan [Member] | Minimum [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |  |
Subsequent Event [Member] | Other Postretirement Benefits Plan [Member] | Maximum [Member] |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% |  |  |

X
- Definition The number of years an employee must provide service to the Company after the initial vesting until the employee is fully vested in the employer matching contributions. + References No definition available. + Details
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- Definition The employee salary deferral contribution percentage that must be elected to receive the employer matching contribution percentage. + References No definition available. + Details
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- Definition The number of hours an employee must provide service to the Company each year in order to be eligible to receive employer matching contributions. + References No definition available. + Details
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- Definition The number of years an employee must provide service to the Company in order to be eligible to receive employer matching contributions. + References No definition available. + Details
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- Definition The number of shares of Class B common stock eligible to be purchased as part of the employee stock purchase plan. + References No definition available. + Details
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- Definition Defined Contribution Plan Number Of Shares Of Class B Common Stock Purchased Under Plan During Current Year + References No definition available. + Details
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- Definition The total number of shares of Class B common stock purchased under the employee stock purchase plan since inception. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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