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Notes Payable (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2016	Dec. 31, 2020	Dec. 31, 2019	Dec. 05, 2013
Debt Instruments [Abstract]
Percentage of unused commitment fee		0.30%
Notes Payable [Member]
Debt Instruments [Abstract]
Aggregate amount of notes payable		$ 1,400,000
Aggregate principal payment due in 2021		500,000	$ 4,400,000
Aggregate principal payment due in 2022		$ 600,000
Minimum [Member]
Debt Instruments [Abstract]
Spread on Libor variable rate		1.25%
Spread on variable rate		0.10%
Minimum [Member] | Notes Payable [Member]
Debt Instruments [Abstract]
Average effective interest rate		3.25%
Maximum [Member]
Debt Instruments [Abstract]
Spread on Libor variable rate		2.00%
Spread on variable rate		1.00%
Maximum [Member] | Notes Payable [Member]
Debt Instruments [Abstract]
Average effective interest rate		5.50%
Credit Facility [Member]
Debt Instruments [Abstract]
Revolving credit facility commitment		$ 150,000,000		$ 125,000,000.0
Revolving credit facility maturity date		Nov. 30, 2025
Remaining revolving credit outstanding		$ 109,000,000.0
Average effective interest rate		2.60%	3.90%
Credit Agreement [Member]
Debt Instruments [Abstract]
Revolving credit facility maturity date		Nov. 30, 2025
Cash and noncash consideration with respect to acquisition after amendment	$ 50,000,000
Credit Agreement [Member] | Maximum [Member]
Debt Instruments [Abstract]
Cash dividends after amendment	$ 50,000,000

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Subparagraph (SX 210.5-02.22(a)(2))
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- Definition

The effective interest rate during the reporting period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of cash and noncash consideration that could pay with respect to acquisition.

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- Definition

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Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred.

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