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Stock Compensation Plans - Performance-Based Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards, fair value | $ 4,740 | $ 3,368 | $ 3,973
Compensation expense |  |  |
Total Compensation | 6,002 | 5,323 | 6,091
Restricted Stock, subject to performance criteria |  |  |
Compensation expense |  |  |
Total Compensation | 1,100 | 1,800 | 2,000
Unamortized future compensation expense | 800 |  |
Tax benefit related to compensation expense | $ 200 | $ 200 | $ 500
Summary of restricted stock activity |  |  |
Nonvested, January 1, 2020 | 492,000 |  |
Shares vested | (102,000) |  |
Shares awarded | 78,000 |  |
Shares forfeited | (9,000) |  |
Nonvested, December 31, 2020 | 459,000 | 492,000 |
Weighted average remaining term (years) |  |  |
Outstanding (years) | 9 months 29 days | 1 year 3 months |
Weighted average grant date fair value |  |  |
Nonvested, January 1, 2020 | $ 14.46 |  |
Shares vested (per share) | 14.46 |  |
Shares awarded (per share) | 19.72 |  |
Shares forfeited (per share) | 18.32 |  |
Nonvested, December 31, 2020 | $ 15.29 | $ 14.46 |
Restricted Stock, subject to performance criteria | Three-year performance targets |  |  |
Plan information |  |  |
Performance period | 3 years |  |
Performance-based restricted stock, earned |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock based compensation awards issued shares | 0 |  |
Performance-based restricted stock, earned | Three-year performance targets |  |  |
Plan information |  |  |
Performance period | 3 years |  |
Vesting period (in years) | 3 years |  |
Market-Based Restricted Stock Units settled in stock |  |  |
Compensation expense |  |  |
Total Compensation | $ 400 |  |
Unamortized future compensation expense | 1,100 |  |
Tax benefit related to compensation expense | $ 100 |  |
Summary of restricted stock activity |  |  |
Shares awarded | 52,000 |  |
Nonvested, December 31, 2020 | 52,000 |  |
Weighted average remaining term (years) |  |  |
Outstanding (years) | 2 years |  |
Weighted average grant date fair value |  |  |
Shares awarded (per share) | $ 28.44 |  |
Nonvested, December 31, 2020 | $ 28.44 |  |
Market-Based Restricted Stock Units settled in stock | Three-year performance targets |  |  |
Plan information |  |  |
Performance period | 3 years |  |
Vesting period (in years) | 3 years |  |
2009 Equity Incentive Plan | Restricted Stock, subject to performance criteria |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock based compensation awards issued shares | 52,000,000 | 81 | 3
Restricted stock awards, fair value | $ 1,500 |  |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(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 Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -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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