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Stock-Based Compensation - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 13, 2019 | Sep. 11, 2017 | Feb. 28, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Surrendered stock options (in shares) |  |  |  | 7,000 | 168,000 | 0
Proceeds from stock options exercised |  |  |  | $ 864,000 | $ 1,442,000 | $ 6,244,000
Tax benefit from stock options exercised |  |  |  | $ 200,000 | $ 700,000 | $ 2,600,000
Options granted (in shares) |  |  |  | 119,000 | 92,000 | 243,000
Restricted stock granted (in shares) |  |  |  | 167,000 | 133,000 | 77,000
Restricted stock vested (in shares) |  |  |  | 109,000 | 119,000 | 146,000
Term of plans / awards |  |  |  | 10 years |  |
Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |
Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Modification expense |  |  |  | $ 0 | $ 0 | $ 0
Unrecognized pre-tax stock-based compensation expense |  |  |  | $ 1,900,000 |  |
Unrecognized pre-tax stock-based compensation expense, period for recognition |  |  |  | 1 year 8 months 12 days |  |
Term of plans / awards |  |  |  | 10 years |  |
Stock Options | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Stock Options | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |
Non-Vested Restricted Stock Award |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized pre-tax stock-based compensation expense |  |  |  | $ 6,900,000 |  |
Unrecognized pre-tax stock-based compensation expense, period for recognition |  |  |  | 1 year 8 months 12 days |  |
Non-Vested Restricted Stock Award | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |
Non-Vested Restricted Stock Award | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Stock Appreciation Rights and Performance Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards granted to date (in shares) |  |  |  | 0 |  |
Outside Directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Surrendered stock options (in shares) |  | 150,000 |  |  |  |
Outside Directors | Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Acceleration of stock-based compensation expense |  |  |  |  | $ 1,200,000 |
Certain Executive Employees | Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options granted (in shares) | 150,780 |  |  |  |  |
Certain Executive Employees | Stock Options | Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Grant date fair value of stock options | $ 1,600,000 |  |  |  |  |
Certain Executive Employees | Stock Options | Vesting on February 13, 2020 | Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage | 33.33% |  |  |  |  |
Certain Executive Employees | Stock Options | Vesting Quarterly Thereafter | Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage | 8.33% |  |  |  |  |
Certain Executive Employees | Non-Vested Restricted Stock Award | Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Restricted stock granted (in shares) |  |  | 210,927 |  |  |
Grant date fair value of restricted stock |  |  | $ 6,000,000 |  |  |
Certain Executive Employees | Non-Vested Restricted Stock Award | Vesting on February 13, 2020 | Subsequent Event | Forecast |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage |  |  | 33.33% |  |  |
Restricted stock vested (in shares) |  |  | 57,270 |  |  |
Certain Executive Employees | Non-Vested Restricted Stock Award | Vesting Quarterly Thereafter | Subsequent Event | Forecast |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage |  |  | 8.33% |  |  |
Certain Executive Employees | Non-Vested Restricted Stock Award | Vesting on February 19, 2020 | Forecast |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage |  |  | 33.33% |  |  |
Restricted stock vested (in shares) |  |  | 153,657 |  |  |

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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 The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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