Aggregate number of common shares reserved for future issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

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- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

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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.

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No definition available.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Percentage of compensation withheld to cover purchase price of common stock

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- Definition

Purchase price of common stock as percentage of lower of fair market value of common stock share on first day of offering period or last day of purchase period

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- Definition

Share-based compensation arrangement by share-based payment award, employer contribution as a percentage of employee contribution

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Share-based compensation arrangement by share-based payment award, employer contribution as a percentage of employee's annual salary

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Employee Benefits And Stock-Based Compensation (401(k) Plan To 2007 Employee Stock Purchase Plan) (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer contribution as a percentage of employee's annual salary	6.00%
Employer contribution under the plan	$ 3.8	$ 3.7	$ 3.4
Common stock were reserved for issuance	11.4
Purchase price of common stock as percentage of lower of fair market value of common stock share on first day of offering period or last day of purchase period	85.00%
Employee Stock Ownership Plan (ESOP), Shares in ESOP	1.2
401 (k) Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee's contribution under the plan	50.00%
Share-Based Compensation Arrangement By Share-Based Payment Award, Employer Contribution As A Percentage Of Employee Contribution	50.00%
Two Thousand Seven Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock were reserved for issuance	6.0
Two Thousand Six Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock were reserved for issuance	27.0
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of compensation withheld to cover purchase price of common stock	2.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of compensation withheld to cover purchase price of common stock	25.00%