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Retirement Plans - Defined Contribution Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined contribution plan disclosures |  |  |
Employer's matching contribution for every dollar the employees contribute (as a percent) | 50.00% |  |
Employer's contribution as a percentage of the maximum an employee is permitted to contribute under IRS limits | 3.00% |  |
Employer's matching contribution, vesting period (in years) | 5 years |  |
Aggregate employer's contribution to pension plans | $ 2.7 | $ 2.6 | $ 2.5
Maximum |  |  |
Defined contribution plan disclosures |  |  |
Employer's contribution as a percentage of employee's eligible compensation | 3.00% |  |

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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 + 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 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 Represents the employer's contribution as a percentage of the maximum amount an employee is permitted to contribute under IRS limits. + References No definition available. + Details
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- Definition Represents the vesting period for employer's matching contribution. + References No definition available. + Details
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- Details
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