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Stock-Based Compensation - Stock Options and Restricted Stock Narrative (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 08, 2018 | Sep. 11, 2017 | Feb. 28, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Surrendered stock options (in shares) |  |  |  | 168,000 | 0 | 8,000
Proceeds from stock options exercised |  |  |  | $ 1,442,000 | $ 6,244,000 | $ 1,712,000
Tax benefit from stock options exercised |  |  |  | $ 700,000 | $ 2,600,000 | $ 500,000
Options granted (in shares) |  |  |  | 92,000 | 243,000 | 77,000
Restricted stock granted (in shares) |  |  |  | 133,000 | 77,000 | 138,000
Restricted stock vested (in shares) |  |  |  | 119,000 | 146,000 | 178,000
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 |  |
Outside directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Surrendered stock options (in shares) |  | 150,000 |  |  |  |
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 |  |  |  | $ 2,000,000 |  |
Unrecognized pre-tax stock-based compensation expense, period for recognition |  |  |  | 1 year 8 months 12 days |  |
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 |  |
Stock options | Outside directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Acceleration of stock-based compensation expense |  |  |  | $ 1,200,000 |  |
Non-vested restricted stock award |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized pre-tax stock-based compensation expense |  |  |  | $ 7,700,000 |  |
Unrecognized pre-tax stock-based compensation expense, period for recognition |  |  |  | 1 year 7 months 6 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 |  |
Subsequent Event | Certain Executive Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options granted (in shares) | 119,220 |  |  |  |  |
Subsequent Event | Stock options | Certain Executive Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Options grant date fair value | $ 1,700,000 |  |  |  |  |
Subsequent Event | Stock options | Certain Executive Employees | Percent Vesting on February 8, 2019 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage | 33.33% |  |  |  |  |
Subsequent Event | Stock options | Certain Executive Employees | Quarterly Vesting |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage | 8.33% |  |  |  |  |
Subsequent Event | Non-vested restricted stock award | Certain Executive Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Restricted stock granted (in shares) |  |  | 133,406 |  |  |
Restricted stock, grant date fair value |  |  | $ 6,000,000 |  |  |
Scenario, Forecast | Non-vested restricted stock award | Certain Executive Employees | Percent Vesting On February 21, 2019 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage |  |  | 33.33% |  |  |
Restricted stock vested (in shares) |  |  | 95,586 |  |  |
Scenario, Forecast | Subsequent Event | Non-vested restricted stock award | Certain Executive Employees | Percent Vesting on February 8, 2019 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage |  |  | 33.33% |  |  |
Restricted stock vested (in shares) |  |  | 37,820 |  |  |
Scenario, Forecast | Subsequent Event | Non-vested restricted stock award | Certain Executive Employees | Quarterly Vesting |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage |  |  | 8.33% |  |  |

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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11283-113907 + Details
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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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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