Number of shares issued during the period to employees related to Restricted stock awards.

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- Definition

Number of shares issued during the period to independent directors.

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No definition available.

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- Definition

Number of shares reserved for the Employee Stock Purchase Plan.

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No definition available.

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- Definition

Percentage of directors stock grant vested on one year anniversary date.

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No definition available.

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Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

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No definition available.

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Amount of expense for employee benefit and equity-based compensation.

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No definition available.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 2
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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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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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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.

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No definition available.

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- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

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No definition available.

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Number of shares authorized for issuance under share-based payment arrangement.

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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.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

No definition available.

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Stockholder's Equity - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2013	Dec. 31, 2006	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to nonvested shares of common stock granted	$ 44,100				$ 44,100
Weighted average period of cost recognized (in years)					3 years 2 months 4 days
Compensation expense related to nonvested stock grants					$ 7,500	$ 6,900
Price of shares issued under Employee Stock Purchase Plan as a percentage of FMV								95.00%
Number of shares reserved for the Employee Stock Purchase Plan (in shares)								250,000
Additional shares authorized for issuance (in shares)							250,000
Treasury shares redeemed to pay income tax	$ 1,213	$ 9,541	$ 1,139	$ 6,933
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares redeemed to satisfy personal tax obligations (in shares)					57,245
Treasury shares redeemed to pay income tax					$ 10,800
2018 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)									2,210,544
Common stock available for issuance (in shares)									1,754,464
2018 Long-Term Incentive Plan \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of vested shares (in years)					5 years
Nonvested stock grants to employees (in shares)					105,800
2018 Long-Term Incentive Plan \| Consultants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock grants to employees (in shares)					5,735
Second Amended and Restated 2005 Non-Employee Directors Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of directors' stock grant vested on one year anniversary date					100.00%
Period of vested shares (in years)					1 year
Second Amended and Restated 2005 Non-Employee Directors Compensation Plan \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock grants to Independent directors (in shares)					7,200