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Equity - Schedule of SARs and Non-Vested Restricted Stock Outstanding (Details) - shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, SARs (in shares) | 116,417 |  |  |
Exercisable, SARs (in shares) | 66,602 |  |  |
Vested or Expected to Vest, SARs (in shares) | 116,417 |  |  |
Outstanding, Non-vested Restricted Stock (in shares) | 83,956 | 62,597 | 80,153 | 95,015
Expected to Vest, Non-vested Restricted Stock (in shares) | 83,956 |  |  |
$10.00 - $24.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, SARs (in shares) | 9,000 |  |  |
Outstanding, Weighted-Average Remaining Contractual Life | 1 year 1 month 6 days |  |  |
Exercisable, SARs (in shares) | 9,000 |  |  |
Exercisable, Weighted-Average Remaining Contractual Life | 1 year 1 month 6 days |  |  |
Vested or Expected to Vest, SARs (in shares) | 9,000 |  |  |
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life | 1 year 1 month 6 days |  |  |
25.00 - 39.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, SARs (in shares) | 40,537 |  |  |
Outstanding, Weighted-Average Remaining Contractual Life | 3 years 8 months 12 days |  |  |
Exercisable, SARs (in shares) | 40,537 |  |  |
Exercisable, Weighted-Average Remaining Contractual Life | 3 years 8 months 12 days |  |  |
Vested or Expected to Vest, SARs (in shares) | 40,537 |  |  |
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life | 3 years 8 months 12 days |  |  |
40.00 - 54.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, SARs (in shares) | 0 |  |  |
Outstanding, Weighted-Average Remaining Contractual Life | 0 years |  |  |
Exercisable, SARs (in shares) | 0 |  |  |
Exercisable, Weighted-Average Remaining Contractual Life | 0 years |  |  |
Vested or Expected to Vest, SARs (in shares) | 0 |  |  |
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life | 0 years |  |  |
55.00 - 69.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, SARs (in shares) | 6,619 |  |  |
Outstanding, Weighted-Average Remaining Contractual Life | 6 years 3 months 18 days |  |  |
Exercisable, SARs (in shares) | 6,619 |  |  |
Exercisable, Weighted-Average Remaining Contractual Life | 6 years 3 months 18 days |  |  |
Vested or Expected to Vest, SARs (in shares) | 6,619 |  |  |
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life | 6 years 3 months 18 days |  |  |
70.00 - 84.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, SARs (in shares) | 54,303 |  |  |
Outstanding, Weighted-Average Remaining Contractual Life | 8 years 10 months 24 days |  |  |
Exercisable, SARs (in shares) | 6,474 |  |  |
Exercisable, Weighted-Average Remaining Contractual Life | 8 years 3 months 18 days |  |  |
Vested or Expected to Vest, SARs (in shares) | 54,303 |  |  |
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life | 8 years 10 months 24 days |  |  |
85.00 - 99.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, SARs (in shares) | 5,958 |  |  |
Outstanding, Weighted-Average Remaining Contractual Life | 7 years 3 months 18 days |  |  |
Exercisable, SARs (in shares) | 3,972 |  |  |
Exercisable, Weighted-Average Remaining Contractual Life | 7 years 3 months 18 days |  |  |
Vested or Expected to Vest, SARs (in shares) | 5,958 |  |  |
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life | 7 years 3 months 18 days |  |  |
$35.00 - $49.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, Non-vested Restricted Stock (in shares) | 0 |  |  |
Outstanding, Weighted-Average Remaining Contractual Life | 0 years |  |  |
Expected to Vest, Non-vested Restricted Stock (in shares) | 0 |  |  |
Expected to Vest, Weighted-Average Remaining Contractual Life | 0 years |  |  |
50.00 - 64.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, Non-vested Restricted Stock (in shares) | 19,622 |  |  |
Outstanding, Weighted-Average Remaining Contractual Life | 2 years 2 months 12 days |  |  |
Expected to Vest, Non-vested Restricted Stock (in shares) | 19,622 |  |  |
Expected to Vest, Weighted-Average Remaining Contractual Life | 2 years 2 months 12 days |  |  |
65.00 - 79.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, Non-vested Restricted Stock (in shares) | 43,804 |  |  |
Outstanding, Weighted-Average Remaining Contractual Life | 1 year 4 months 24 days |  |  |
Expected to Vest, Non-vested Restricted Stock (in shares) | 43,804 |  |  |
Expected to Vest, Weighted-Average Remaining Contractual Life | 1 year 4 months 24 days |  |  |
80.00 - 94.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, Non-vested Restricted Stock (in shares) | 20,530 |  |  |
Outstanding, Weighted-Average Remaining Contractual Life | 9 months 18 days |  |  |
Expected to Vest, Non-vested Restricted Stock (in shares) | 20,530 |  |  |
Expected to Vest, Weighted-Average Remaining Contractual Life | 9 months 18 days |  |  |

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- Definition Weighted average remaining contractual term for equity-based awards excluding options expected to vest, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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