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Employee Benefit Plan (Narrative) (Details) - Defined Contribution Plan [Member] - Defined Contribution Benefit Plan [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employees' vesting percentage in matching contributions (percent) | 100.00% |  |
Contributions made by the Company under the Plan | $ 5.5 | $ 5.8 | $ 6.0
Defined Contribution Plan Tranches One [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution (percent) | 100.00% |  |
Employee's salary contribution (percent) | 3.00% |  |
Defined Contribution Plan Tranches Two [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution (percent) | 50.00% |  |
Employee's salary contribution (percent) | 2.00% |  |

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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 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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- Definition Amount of payment for other postretirement benefits. Excludes pension benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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