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Stock-Based Compensation - Summary of Restricted Stock and RSU to be Settled in Common Stock Activity (Details) - Restricted Stock and RSUs to be Settled in Common Stock - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Unvested, shares, beginning of period (in shares)	3,265
Shares granted (in shares)	2,029	2,100	1,600
Vested, shares (in shares)	(1,269)	(1,300)	(1,400)
Forfeited, shares (in shares)	(156)
Unvested, shares, end of period (in shares)	3,869	3,265
Weighted Average Grant Date Fair Value (Per share)
Unvested, weighted average grant date fair value, beginning of period (in usd per share)	$ 35.34
Weighted average grant date fair value (in dollars per share)	39.91	$ 35.62	$ 34.37
Vested, weighted average grant date fair value (in usd per share)	35.69
Forfeited, weighted average grant date fair value (in usd per share)	36.67
Unvested, weighted average grant date fair value, end of period (in usd per share)	$ 37.57	$ 35.34

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than option forfeited in period weighted average grant date fair value.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The number of grants made 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

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

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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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