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 Date Granted

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No definition available.

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

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No definition available.

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- Definition

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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- Definition

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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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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- 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).

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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.

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No definition available.

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- Definition

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

+ References

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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-Paragraph 2
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- Definition

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

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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.

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No definition available.

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Stockholder's Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 07, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to nonvested shares of common stock granted	$ 28,100				$ 28,100
Weighted average period of cost recognized					3 years 3 months 7 days
Compensation expense related to nonvested stock grants	$ 2,600		$ 2,300		$ 4,400	$ 3,900
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				250,000
Additional shares authorized for issuance (in shares)					250,000
Shares redeemed to satisfy personal tax obligations (in shares)					66,181
Treasury shares redeemed to pay income tax	$ 912	$ 7,692	$ 628	$ 3,467
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury shares redeemed to pay income tax					$ 7,300
AFAM Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares redeemed to satisfy personal tax obligations (in shares)					25,542
Treasury shares redeemed to pay income tax					$ 1,100
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)							2,030,629
2018 Long-Term Incentive Plan \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of vested shares					5 years
Nonvested stock grants to employees (in shares)					141,945
Granted (in dollars per share)					$ 68.81
Second Amended and Restated 2005 Non-Employee Directors Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock grants to Independent directors (in shares)					3,500
Percentage of directors' stock grant vested on one year anniversary date					100.00%
Period of vested shares					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)					10,800
Percentage of directors' stock grant vested on one year anniversary date					33.00%
Percentage of directors' stock grant vested on grant date					33.00%
Second Amended and Restated 2005 Non-Employee Directors Compensation Plan \| Transitional Advisory Council
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock grants to Independent directors (in shares)					3,600