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Stock-Based Compensation Plans - Summary of Nonvested LTIP Performance Shares (Details) - LTIP Performance Shares | 9 Months Ended
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Sep. 30, 2019 $ / shares shares
Number of Shares at Expected Attainment |
Nonvested, beginning balance (in shares) | shares | 540,697
Forfeited (in shares) | shares | (23,029)
Change in attainment (in shares) | shares | 377,557
Nonvested, ending balance (in shares) | shares | 895,225
Weighted Average Grant Date Fair Value |
Nonvested, beginning balance (in dollars per share) | $ / shares | $ 19.83
Forfeited (in dollars per share) | $ / shares | 20.12
Change in attainment (in dollars per share) | $ / shares | 20.22
Nonvested, ending balance (in dollars per share) | $ / shares | $ 19.99

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- Definition The net change in awards outstanding during the reporting period as a result of a change in the expected attainment percentage of an award. + References No definition available. + Details
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- Definition The weighted average fair value as of the grant date for equity-based award plans other than stock (unit) option plans that had a net change in the awards outstanding during the reporting period as a result of a change in the expected attainment percentage of an award. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=116856206&loc=d3e5070-113901 + Details
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