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Stockholders' Equity - Narrative Restricted Stock Awards and Stock Option Grants (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |
Weighted average exercise price (USD per share) | $ 19.31 | $ 19.27 |
Deferred and Matching Restricted Stock Units |  |  |
Class of Stock [Line Items] |  |  |
Stock issued during period, MSPP (in shares) | 0 |  |
Restricted Stock |  |  |
Class of Stock [Line Items] |  |  |
Options vested in period, fair value | $ 3.7 | $ 3.3 | $ 4.0
Grants in period, weighted average grant date fair value (USD per share) | $ 17.43 | $ 17.47 | $ 15.49
Compensation not yet recognized,share-based awards other than options | $ 6.3 | $ 5.8 |
Compensation cost not yet recognized, period for recognition | 1 year 8 months 8 days | 2 years 5 months 15 days |
Performance Restricted Stock Units |  |  |
Class of Stock [Line Items] |  |  |
Grants in period, weighted average grant date fair value (USD per share) |  | $ 17.34 | $ 14.60
Compensation not yet recognized,share-based awards other than options | $ 0.9 | $ 0.9 |
Compensation cost not yet recognized, period for recognition | 1 year 8 months 26 days | 1 year 10 months 13 days |
Total unrecognized compensation costs related to stock option awards (in years) | $ 0.8 | $ 0.8 | $ 0.7
Employee Stock Option |  |  |
Class of Stock [Line Items] |  |  |
Compensation cost not yet recognized, period for recognition | 1 year 8 months 8 days | 2 years 3 months 25 days |
Weighted average exercise price (USD per share) | $ 5.98 | $ 6.30 | $ 5.81
Total unrecognized compensation costs related to stock option awards | $ 2.7 | $ 3.4 |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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=116856206&loc=d3e5070-113901 + Details
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