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Stock-Based Compensation Plans - Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) period shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Oct. 31, 1996 shares
Additional disclosures |  |  |  |
Stock-based compensation expense | $ 25,100 | $ 21,110 | $ 24,885 |
Capitalized stock-based compensation cost | $ 9,472 | 9,974 | 9,396 |
Employee Stock Purchase Plan [Abstract] |  |  |  |
Shares issued under Employee Stock Purchase Plan | shares | 21,362 |  |  |
Stock-based compensation expense | $ 25,100 | 21,110 | 24,885 |
Performance awards |  |  |  |
Additional disclosures |  |  |  |
Percentage of stock based compensation elected to be received in the form of stock options upon the election of the recipient | 25.00% |  |  |
Maximum Measurement Period (in years) | 3 years |  |  |
Award vesting period (in years) | 3 years |  |  |
Performance awards | Maximum |  |  |  |
Additional disclosures |  |  |  |
Percentage of stock based compensation elected to be received in the form of stock options upon the election of the recipient | 100.00% |  |  |
Restricted Stock and Restricted Stock Units |  |  |  |
Additional disclosures |  |  |  |
Unrecognized compensation cost for unvested stock options | $ 39,440 |  |  |
Weighted average period for recognition of unrecognized compensation cost | 1 year 8 months 12 days |  |  |
Non Qualified Employee Stock Purchase Plan |  |  |  |
Additional disclosures |  |  |  |
Stock-based compensation expense | $ 1,609 | $ 537 | $ 761 |
Employee Stock Purchase Plan [Abstract] |  |  |  |
Employee stock purchase plan, shares of common stock reserved for issuance | shares |  |  |  | 1,000,000
Employee stock purchase plan, remaining shares of common stock available for issuance | shares | 612,912 |  |  |
Employment period of full-time employees for becoming eligible to participate in the plan (in months) | 1 month |  |  |
Number of purchase periods | period | 2 |  |  |
Employee stock purchase plan, discounted stock price percentage | 85.00% |  |  |
Shares issued under Employee Stock Purchase Plan | shares | 21,362 | 20,161 | 13,894 |
Stock-based compensation expense | $ 1,609 | $ 537 | $ 761 |
2009 Plan |  |  |  |
Additional disclosures |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, aggregate intrinsic value, outstanding | 22,102 |  |  |
Options exercisable intrinsic value | $ 1,187 |  |  |
Employee Stock Purchase Plan [Abstract] |  |  |  |
Employee stock purchase plan, remaining shares of common stock available for issuance | shares | 6,088,456 |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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