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Stock Compensation Plans - Time-Based Restricted Stock Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Compensation expense |  |  |  |
Total Compensation |  | $ 6,002 | $ 5,323 | $ 6,091
Restricted Stock, subject to time-based criteria |  |  |  |
Compensation expense |  |  |  |
Total Compensation |  | 700 | 500 | 2,000
Unamortized future compensation expense |  | 500 |  |
Tax benefit related to compensation expense |  | $ 200 | $ 200 | $ 500
Summary of restricted stock activity |  |  |  |
Nonvested, January 1, 2020 | 121 | 121 |  |
Shares vested |  | (65) |  |
Nonvested, December 31, 2020 |  | 56 | 121 |
Weighted average remaining term (years) |  |  |  |
Outstanding (years) |  | 10 months 20 days | 1 year 8 months 15 days |
Weighted average grant date fair value |  |  |  |
Nonvested, January 1, 2020 | $ 14.88 | $ 14.88 |  |
Shares vested (per share) |  | 14.47 |  |
Nonvested, December 31, 2020 |  | $ 14.60 | $ 14.88 |
Restricted Stock, subject to time-based criteria | Tranche One |  |  |  |
Plan information |  |  |  |
Vesting period (in years) |  | 1 year |  |
Compensation expense |  |  |  |
Vesting rights percentage |  | 25.00% |  |
Restricted Stock, subject to time-based criteria | Share-based Payment Employee |  |  |  |
Plan information |  |  |  |
Vesting period (in years) |  | 4 years |  |
Restricted Stock, subject to time-based criteria | Share-based Payment Employee | Executive officers |  |  |  |
Plan information |  |  |  |
Vesting period (in years) |  | 4 years |  |
Time-Based Restricted Stock Units settled in stock |  |  |  |
Compensation expense |  |  |  |
Total Compensation |  | $ 2,500 | $ 1,000 |
Unamortized future compensation expense |  | 5,100 |  |
Tax benefit related to compensation expense |  | $ 500 | $ 300 |
Summary of restricted stock activity |  |  |  |
Shares vested |  | (121) |  |
Shares awarded |  | 331 |  |
Shares forfeited |  | (21) |  |
Nonvested, December 31, 2020 | 190 | 379 |  |
Weighted average remaining term (years) |  |  |  |
Outstanding (years) | 2 years 6 months 14 days | 2 years 6 months 18 days |  |
Weighted average grant date fair value |  |  |  |
Shares vested (per share) |  | $ 14.91 |  |
Shares awarded (per share) |  | 17.81 |  |
Shares forfeited (per share) |  | 15.07 |  |
Nonvested, December 31, 2020 | $ 13.78 | $ 16.87 |  |
Time-Based Restricted Stock Units settled in stock | Tranche One |  |  |  |
Plan information |  |  |  |
Vesting period (in years) |  | 1 year |  |
Compensation expense |  |  |  |
Vesting rights percentage |  | 25.00% |  |
Time-Based Restricted Stock Units settled in stock | Share-based Payment Employee |  |  |  |
Plan information |  |  |  |
Vesting period (in years) |  | 4 years |  |
Time-Based Restricted Stock Units settled in stock | Share-based Payment Employee | Executive officers |  |  |  |
Plan information |  |  |  |
Vesting period (in years) |  | 4 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 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 number of grants made 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 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 The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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