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

No definition available.

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- Definition

Number of shares issued during the period to independent directors.

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
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- Definition

Number of shares reserved for the Employee Stock Purchase Plan.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Percentage Of Directors Stock Grant Vested On Date Granted

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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- Definition

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

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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=109197908&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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=109197908&loc=d3e5070-113901

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Data Type:	num:perShareItemType
Balance Type:	na
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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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Period Type:	duration

- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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=109197908&loc=d3e5070-113901

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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Period Type:	duration

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- Details

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Stockholder's Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jun. 07, 2018
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%
Granted (in dollars per share)	$ 67.16
Total unrecognized compensation cost related to nonvested shares of common stock granted	$ 29,600
Weighted average period of cost recognized	3 years 4 months 20 days
Compensation expense related to nonvested stock grants	$ 1,800	$ 1,600
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
Shares redeemed to satisfy personal tax obligations (in shares)	59,967
Treasury shares redeemed to pay income tax	$ 7,692	$ 3,467
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock grants to Independent directors (in shares)	10,800
Period of vested shares	1 year
Transitional Advisory Council
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock grants to Independent directors (in shares)	3,600
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of vested shares	5 years
Treasury shares redeemed to pay income tax	$ 6,600
AFAM Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares redeemed to satisfy personal tax obligations (in shares)	24,044
Treasury shares redeemed to pay income tax	$ 900
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)			2,047,244
2018 Long-Term Incentive Plan \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock grants to employees (in shares)	128,930
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	33.00%
Percentage of directors' stock grant vested on grant date	33.00%