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Employee Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Definedcontributionemployeeautomaticcontributionpercentag	6.00%
Company 401K plan contribution (percentage)	3.00%
Employer matching contribution, percent of match	100.00%
Maximum annual contributions per employee, percent	6.00%
Employee salary deferral contributions percentage vested	100.00%
Employer contribution annual vesting percentage	20.00%
Employer matching contributions	$ 6,100	$ 5,900	$ 9,000
Administrative expenses	$ 0	0	100
Profits sharing, percent of pre-tax profit paid to eligible employees on quarterly basis	10.00%
Profit sharing expense	$ 8,400	$ 9,000	$ 8,000
Effective January 1, 2016
Defined Benefit Plan Disclosure [Line Items]
Company 401K plan contribution (percentage)	3.00%
Employer matching contribution, percent of match	175.00%
Maximum annual contributions per employee, percent	6.00%
Over Two Years
Defined Benefit Plan Disclosure [Line Items]
Company 401K plan contribution (percentage)	3.00%

X

- Definition

Percentage employees are vested in annual salary deferral contibutions.

+ References

No definition available.

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X

- Definition

Employee automatic contribution percentage

+ References

No definition available.

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- Definition

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- Definition

Profit sharing expense during the period.

+ References

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- Definition

Profit Sharing, Percent of Pre-tax Profit Paid to Eligible Employees on Quarterly Basis

+ References

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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.

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No definition available.

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- Definition

Amount of administrative expense incurred by defined contribution plan.

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X

- 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

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

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