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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2019 | Jun. 03, 2019 | Mar. 01, 2019 | Sep. 01, 2018 | Jun. 01, 2018 | Mar. 01, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  | 1 year 8 months 12 days |
Shares Reserved (in shares) |  |  |  |  |  |  | 2,709,000 |  | 2,709,000 |
Shares Available to Issue (in shares) |  |  |  |  |  |  | 1,952,000 |  | 1,952,000 |
Options Outstanding (in shares) |  |  |  |  |  |  | 1,076,000 |  | 1,076,000 |
Performance Awards Outstanding (in shares) |  |  |  |  |  |  | 501,000 |  | 501,000 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  |  |  |  | $ 1,700 |  | $ 1,700 |
Directors compensation expense |  |  |  |  |  |  | $ 113 | $ 133 | $ 341 | $ 336
Treasury stock acquired, shares |  |  |  |  |  |  |  |  | 400,000 |
Treasury Stock, Value |  |  |  |  |  |  |  |  | $ 7,756 | $ 0
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  | $ 19.39 |
Dividends declared per common share (in dollars per Share) | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.225 | $ 0.225
Dividends | $ 1,336 | $ 1,365 | $ 1,360 | $ 1,436 | $ 1,433 | $ 1,207 |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage |  |  |  |  |  |  | 200.00% |  | 200.00% |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  | $ 600 |  | $ 600 |
ESPP |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | 58 |  | 224 | $ 208
Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | 196 | $ 215 | $ 624 | 681
Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  | 20.00% |
Share-based compensation expense |  |  |  |  |  |  | 160 | 238 | $ 513 | 955
Officers And Key Employees [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  |  |  | $ 61 | $ 344 | $ 138 | $ 964
Amended And Restated 2006 Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares Reserved (in shares) |  |  |  |  |  |  | 0 |  | 0 |
Shares Available to Issue (in shares) |  |  |  |  |  |  | 0 |  | 0 |
Options Outstanding (in shares) |  |  |  |  |  |  | 940,000 |  | 940,000 |
Performance Awards Outstanding (in shares) |  |  |  |  |  |  | 0 |  | 0 |
Cancelled shares (in shares) |  |  |  |  |  |  |  |  | 1,154,000 |
2017 Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares Reserved (in shares) |  |  |  |  |  |  | 2,709,000 |  | 2,709,000 |
Shares Available to Issue (in shares) |  |  |  |  |  |  | 1,952,000 |  | 1,952,000 |
Options Outstanding (in shares) |  |  |  |  |  |  | 136,000 |  | 136,000 |
Performance Awards Outstanding (in shares) |  |  |  |  |  |  | 501,000 |  | 501,000 |

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