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Common Stock (Employee Stock Purchase Plan) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
May 18, 2012 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | $ 7.1 | $ 10.6 | $ 11.4
Total fair value of the shares purchased under the plan |  | 0.1 | 0.8 | 1.0
Employee Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Registered shares of common stock (in shares) | 500,000 |  |  |
Percent of common stock fair market value | 85.00% |  |  |
Offering period | 3 months |  |  |
Maximum employee compensation payroll deductions may not exceed | 10.00% |  |  |
Maximum shares employees may purchase in any one offering period (in shares) | 1,000 |  |  |
Share-based compensation expense |  | $ 0.1 | $ 0.1 | $ 0.1

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Purchase Power During Offering Period + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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