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Employee Benefit Plans Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Benefit Plans [Line Items]
Matching contributions recorded in Compensation and related expense	$ 3,900,000	$ 4,600,000	$ 4,400,000
401(k) Plan [Member] [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	50.00%
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
401(k) Plan [Member] [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] [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] [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] [Member] | Minimum [Member]
Employee Benefit Plans [Line Items]
Employee contribution percentage	1.00%
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	8,364
Defined Contribution Plan Number Of Shares Of Class B Common Stock Purchased Under Plan Since Inception	167,619

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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X

- 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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X

- 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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X

- 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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X

- 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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X

- 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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Balance Type:	na
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X

- 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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X

- 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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X

- 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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X

- 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

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X

- 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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X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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X

- 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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X

- 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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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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