Stock-Based Compensation - Summary of Status of Plans (Details)	9 Months Ended
Sep. 30, 2021 shares
2018 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	2,500,000
Maximum potential RSU and cash settled awards outstanding	611,278
RSUs and cash settled awards vested and released	117,633
Awards available for grant	1,771,089
2014 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	1,500,000
Maximum potential RSU and cash settled awards outstanding	35,100
2009 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	3,400,000
Maximum potential RSU and cash settled awards outstanding	45,200
2004 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	6,500,000
Maximum potential RSU and cash settled awards outstanding	14,545
Directors' Plan
Summary of Status of Equity-Based Compensation Plans
Maximum potential RSU and cash settled awards outstanding	4,722

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Released Life-to-Date

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- Definition

Share based compensation arrangement by share based payment award number of shares originally available.

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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.

+ 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=120381028&loc=d3e5070-113901

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