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Share-based Compensation (Restricted Stock Awards And Restricted Stock Units Activity Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restricted Stock Awards |  |  |
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items] |  |  |
RSAs and RSUs general vesting period | 3 years |  |
Shares granted in period (shares) | 13 |  |
Weighted average grant date fair value of granted (in dollars per share) | $ 18.61 | $ 6.84 | $ 10.28
Grant date fair value of awards | $ 0.2 | $ 0.2 | $ 0.2
Unrecognized share-based compensation expense related to unvested awards | $ 0.1 |  |
Amortized over a weighted average period | 5 months 5 days |  |
Awards vested in period (shares) | 24 |  |
Restricted Stock Units |  |  |
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items] |  |  |
RSAs and RSUs general vesting period | 3 years |  |
Shares granted in period (shares) | 1,404 |  |
Weighted average grant date fair value of granted (in dollars per share) | $ 14.34 | $ 6.84 | $ 9.16
Grant date fair value of awards | $ 9.7 | $ 8.3 | $ 8.0
Awards vested in period (shares) | 1,123 |  |
Time-based RSUs |  |  |
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items] |  |  |
Shares granted in period (shares) | 400 | 1,100 | 1,000
Unrecognized share-based compensation expense related to unvested awards | $ 7.7 |  |
Amortized over a weighted average period | 1 year 3 months 15 days |  |
Awards vested in period (shares) | 900 | 700 | 600
Performance-based RSUs |  |  |
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items] |  |  |
Shares granted in period (shares) | 1,000 | 1,300 | 1,200
Unrecognized share-based compensation expense related to unvested awards | $ 6.4 |  |
Amortized over a weighted average period | 2 years 4 months 7 days |  |
Awards vested in period (shares) | 200 | 100 | 100
Minimum | Performance-based RSUs |  |  |
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items] |  |  |
Percentage of performance range of RSUs that may be awarded (percent) | 0.00% |  |
Maximum | Performance-based RSUs |  |  |
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items] |  |  |
Percentage of performance range of RSUs that may be awarded (percent) | 200.00% |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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