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Stock Options and Employee Stock Purchase Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of options outstanding (in shares) | 430,250 |  | 430,250 |  | 475,601
Total intrinsic values of options exercised in period |  |  | $ 4,000 | $ 3,000 |
Compensation cost recognized | $ 6,251 | $ 6,530 | $ 12,363 | $ 12,843 |
Estimated forfeiture rates |  |  | 12.22% | 11.52% |
Cash received upon the issuance of common stock |  |  | $ 4,232 | $ 3,303 |
Share-based Payment Arrangement, Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation cost recognized | 200 | 200 | 400 | $ 400 |
Unrecognized compensation cost related to non-vested awards granted | 5,300 |  | $ 5,300 |  | $ 5,800
Weighted-average period to recognize compensation cost (in years) |  |  | 4 years 6 months |  |
Restricted (Performance) Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted (in shares) |  |  | 73,094 | 82,112 |
Granted (in usd per share) |  |  | $ 94.40 | $ 70.99 |
Restricted Stock And Restricted Stock Unit (RSU) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation cost recognized | 5,400 | 5,700 | $ 10,700 | $ 11,300 |
Unrecognized compensation cost related to non-vested awards granted | $ 43,800 |  | $ 43,800 |  | $ 38,600
Restricted Stock And Restricted Stock Unit (RSU) | Board of Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting periods |  |  | 1 year |  |
Restricted Stock And Restricted Stock Unit (RSU) | Chief Executive Officer |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting periods |  |  | 8 years |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of stocks outstanding (in shares) | 484,205 |  | 484,205 |  | 820,566
Weighted-average period to recognize compensation cost (in years) |  |  | 3 years 10 months 24 days |  |
Granted (in shares) |  |  | 0 |  |
Granted (in usd per share) |  |  | $ 0 |  |
Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average period to recognize compensation cost (in years) |  |  | 4 years 3 months 18 days |  |
Granted (in shares) |  |  | 163,380 |  |
Minimum | Restricted Stock And Restricted Stock Unit (RSU) | Senior Staff |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting periods |  |  | 4 years |  |
Maximum | Restricted Stock And Restricted Stock Unit (RSU) | Senior Staff |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting periods |  |  | 5 years |  |
2007 Stock Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum issuance of common stock (in shares) | 4,500,000 |  | 4,500,000 |  |
Purchase price of common stock, percent |  |  | 85.00% |  |
Number of options outstanding (in shares) | 7,250 |  | 7,250 |  |
Number of stocks outstanding (in shares) | 0 |  | 0 |  |
2015 Stock Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum issuance of common stock (in shares) | 4,200,000 |  | 4,200,000 |  |
Number of options outstanding (in shares) | 423,000 |  | 423,000 |  |
Number of stocks outstanding (in shares) | 272,940 |  | 272,940 |  |
2015 Stock Option Plan | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Market value of common stock on the date of grant for incentive stock options |  |  | 100.00% |  |
Employee Stock Purchase Plan | Common stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum issuance of common stock (in shares) | 2,000,000,000,000 |  | 2,000,000,000,000 |  |
Market value of common stock on the date of grant for incentive stock options |  |  | 85.00% |  |
Compensation cost recognized | $ 700 | $ 600 | $ 1,300 | $ 1,100 |
Estimated forfeiture rates |  |  | 11.15% | 16.50% |
Number of shares available for issuance (in shares) | 0 |  | 0 |  |
Maximum earnings withheld by the employees | 15.00% |  | 15.00% |  |
Issuance of shares under employee stock purchase plan (in shares) |  |  | 58,145 | 53,694 |
Cash received upon the issuance of common stock |  |  | $ 4,200 | $ 3,300 |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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