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Stockholders' Equity - Narrative Restricted Stock Awards and Stock Option Grants (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |
Weighted average exercise price (in dollars per share) | $ 19.27 | $ 19.52 |
Restricted Stock |  |  |
Class of Stock [Line Items] |  |  |
Options vested in period, fair value | $ 3.3 | $ 4.0 | $ 3.6
Grants in period, weighted average grant date fair value (USD per share) | $ 17.45 | $ 15.25 | $ 17.32
Compensation not yet recognized,share-based awards other than options | $ 5.8 | $ 5.7 | $ 6.2
Compensation cost not yet recognized, period for recognition | 2 years 5 months 15 days | 2 years 4 months 20 days | 2 years 6 months
Granted (in shares) | 309 |  |
Performance Restricted Stock Units |  |  |
Class of Stock [Line Items] |  |  |
Compensation not yet recognized,share-based awards other than options | $ 0.9 |  |
Compensation cost not yet recognized, period for recognition | 1 year 10 months 13 days |  |
Granted (in shares) | 49 | 45 |
Stock issued during period, value, restricted stock award, gross | $ 0.8 | $ 0.7 |
Employee Stock Option |  |  |
Class of Stock [Line Items] |  |  |
Compensation cost not yet recognized, period for recognition | 2 years 3 months 25 days | 1 year 8 months 26 days |
Weighted average exercise price (in dollars per share) | $ 6.30 | $ 5.81 | $ 3.79
Compensation not yet recognized, stock options | $ 3.4 | $ 3.5 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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