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Employee Benefit Plan (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Days | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan Minimum Hours of Service | 1,000 |  |
Defined contribution plan, minimum employee contribution of annual compensation | 2.00% |  |
Defined contribution plan, percentage at which employees vest annually in employer contributions | 20.00% |  |
Defined Contribution Plan Minimum Years of Service Before Vesting Of Employer Contributions | 2 years |  |
Defined Benefit Plan, Contributions by Employer | $ | $ 1,441 | $ 1,056 | $ 1,178
Defined contribution plan, maximum employee contribution matched by employer | 6.00% |  |
Defined contribution plan, maximum employee contribution of annual compensation | 80.00% |  |
Defined contribution plan, employer match percentage | 25.00% |  |
Defined contribution plan, minimum age requirement | 21 |  |
Defined Contribution Plan minimum number of days of employee service required | Days | 90 |  |

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- Definition Minimum employee age requirement before eligible for participation in defined contribution plan + References No definition available. + Details
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- Definition Minimum employee contribution as a percentage of annual compensation to the defined contribution plan. + References No definition available. + Details
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- Definition Minimum number of employee service hours required before eligible for participation in defined contribution plan + References No definition available. + Details
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- Definition Minimum number of days of employee service required before eligible for participation in defined contribution plan + References No definition available. + Details
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- Definition Defined Contribution Plan Minimum Years of Service Before Vesting Of Employer Contributions + References No definition available. + Details
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