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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 147 Months Ended | 195 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2014 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | May 20, 2020 | May 19, 2020 | Dec. 31, 2008 | Dec. 31, 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 1,008 | $ 1,634 |  |  |  |  |  |  |
Stock-based compensation expense to be recognized through results of operations |  | $ 6,396 |  | $ 6,396 | $ 6,396 |  |  |  |  |
Employee Stock Award Plan-2008 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  | 579,589 |  | 579,589 | 579,589 | 700,680 |  |  | 1,900,000 |
Additional shares authorized (in shares) | 1,500,000 | 0 |  | 1,500,000 |  |  |  |  |  |
Employee Stock Award Plan-2008 | Options Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Expiration period |  | 10 years |  |  |  |  |  |  |  |
Employee Stock Award Plan-2008 | Share-based Compensation Award, Tranche One |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting rights percentage |  | 20.00% |  |  |  |  |  |  |  |
Employee Stock Award Plan-2008 | Share-based Compensation Award, Tranche One | Restricted Stock Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |  |  |  |
Employee Stock Award Plan-2008 | Share-based Compensation Award, Tranche Two |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting rights percentage |  | 33.30% |  |  |  |  |  |  |  |
Employee Stock Award Plan-2008 | Share-based Compensation Award, Tranche Two | Restricted Stock Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  | 5 years |  |  |  |  |  |  |  |
Director Plan - 2005 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  | 162,862 |  | 162,862 | 162,862 | 160,135 | 450,000 | 300,000 |  | 300,000
Additional shares authorized (in shares) |  | 0 |  |  | 150,000 |  |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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