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Share Based Compensation Arrangement By Share Based Payment Award Maximum Measurement Period

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Represents the number of purchase periods to acquire shares of the entity's common stock through payroll deductions.

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Represents the percentage of stock based compensation to be received in the form of stock options upon the election of the recipient.

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Estimated period over which a full-time employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost capitalized for award under share-based payment arrangement.

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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.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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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.

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Discount rate from fair value on purchase date that participants pay for shares.

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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.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. 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.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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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