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Stock Compensation Plans - Performance-Based Restricted Stock Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Compensation expense |  |  |
Total Compensation | $ 5,323 | $ 6,091 | $ 5,372
Restricted Stock, subject to performance criteria |  |  |
Compensation expense |  |  |
Total Compensation | 1,800 | 2,000 | 1,300
Unamortized future compensation expense | 3,100 |  |
Tax benefit related to compensation expense | $ 200 | $ 500 | $ 500
Summary of restricted stock activity |  |  |
Nonvested, January 1, 2019 | 330 |  |
Shares vested | (9) |  |
Shares awarded | 226 |  |
Shares forfeited | (55) |  |
Nonvested, December 31, 2019 | 492 | 330 |
Weighted average remaining term (years) |  |  |
Outstanding (years) | 1 year 3 months | 1 year 5 months 12 days |
Weighted average grant date fair value |  |  |
Nonvested, January 1, 2019 | $ 15.07 |  |
Shares vested (per share) | 27.13 |  |
Shares awarded (per share) | 14.12 |  |
Shares forfeited (per share) | 14.65 |  |
Nonvested, December 31, 2019 | $ 14.46 | $ 15.07 |
Restricted Stock, subject to performance criteria | Three-year performance targets |  |  |
Plan information |  |  |
Performance period | 3 years |  |
Performance-based restricted stock, earned | Three-year performance targets |  |  |
Plan information |  |  |
Performance period | 3 years |  |
Vesting period (in years) | 3 years |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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