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Stock-Based Compensation - Summary of PSUs and RSUs to be Settled in Common Stock Activity (Details) - $ / shares shares in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Restricted Stock and RSUs to be Settled in Common Stock |  |
Shares |  |
Unvested, shares, beginning of period (in shares) | 3,869 | 3,265
Shares granted (in shares) | 945 | 2,008
Vested, shares (in shares) | (1,442) | (1,228)
Forfeited, shares (in shares) | (119) | (114)
Unvested, shares, end of period (in shares) | 3,253 | 3,931
Weighted Average Grant Date Fair Value |  |
Unvested, weighted average grant date fair value, beginning of period (in usd per share) | $ 37.57 | $ 35.34
Weighted average grant date fair value (in dollars per share) | 82.75 | 39.65
Vested, weighted average grant date fair value (in usd per share) | 36.92 | 35.68
Forfeited, weighted average grant date fair value (in usd per share) | 47.23 | 36.26
Unvested, weighted average grant date fair value, end of period (in usd per share) | $ 50.71 | $ 37.41
Performance Stock Units |  |
Shares |  |
Unvested, shares, beginning of period (in shares) | 1,047 | 848
Shares granted (in shares) | 174 | 436
Vested, shares (in shares) | (268) | (238)
Forfeited, shares (in shares) | (11) | 0
Unvested, shares, end of period (in shares) | 942 | 1,046
Weighted Average Grant Date Fair Value |  |
Unvested, weighted average grant date fair value, beginning of period (in usd per share) | $ 37.65 | $ 33.20
Weighted average grant date fair value (in dollars per share) | 90.44 | 34.59
Vested, weighted average grant date fair value (in usd per share) | 38.28 | 17.48
Forfeited, weighted average grant date fair value (in usd per share) | 36.90 |
Unvested, weighted average grant date fair value, end of period (in usd per share) | $ 47.27 | $ 37.35

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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. + References No definition available. + Details
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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 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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). + 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=120381028&loc=d3e5070-113901 + Details
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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=120381028&loc=d3e5070-113901 + Details
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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 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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