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Employee Benefit Plans Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Employee Benefit Plans [Line Items] |  |  |
Matching contributions recorded in Compensation and related expense | $ 4,800,000 | $ 3,900,000 | $ 4,600,000
401(k) plan [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
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 |  |
401(k) plan [Member] | First Salary Deferral Contribution [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Employee contribution percentage | 2.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% |  |
401(k) plan [Member] | Second Salary Deferral Contribution [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Employee contribution percentage | 4.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
401(k) plan [Member] | Total Potential Salary Deferral Contribution [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 4.00% |  |
401(k) plan [Member] | Minimum [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Employee contribution percentage | 1.00% |  |
401(k) plan [Member] | Maximum [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 50.00% |  |
Deferred Profit Sharing [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Matching contributions recorded in Compensation and related expense | $ 0 | $ 0 | $ 0
Number of hours of service for eligibility in profit sharing plan, per year | 500 |  |
Number of shares in profit sharing plan | 400,000 |  |
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 | 9,012 |  |
Defined Contribution Plan Number Of Shares Of Class B Common Stock Purchased Under Plan Since Inception | 176,631 |  |

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 participate in the profit sharing plan. + 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 held in the profit sharing plan as of the balance sheet date. + 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 The amount of the cost recognized during the period for defined contribution plans. + 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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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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