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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% |  |

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- Definition Employee automatic contribution percentage + References No definition available. + 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 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 + Details
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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. + 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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- Details
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