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Other Employee Benefit Plans (Details) - USD ($)		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Percentage of company matching contribution to 401(K) plan		50.00%
Defined contribution plan employer matching contribution percent		3.00%
Company's contributions to 401(K) plan		$ 1,300,000	$ 1,100,000	$ 1,100,000
Common stock shares purchase price limit for employees as percentage of market value under Employee Stock Purchase Plan		90.00%
Employee stock purchase plan maximum percentage of purchase employee can make on eligible compensation		10.00%
Maximum number of shares available for purchase by participating employees		2,500,000
Forecast
Maximum annual contribution to 401(k) plan by employees, effective January 1, 2017	$ 18,500

X

- Definition

Employee stock purchase plan, maximum percentage of purchase an employee can make on eligible compensation.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Employee stock purchase plan, percentage of purchase price from market value.

+ References

No definition available.

+ Details

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X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ 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

Maximum amount the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

+ Details

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X

- Details

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