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Stock-Based Compensation - Nonvested performance share units (Details) - Performance Shares - $ / shares shares in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020
Total Stockholder Return |  |  |  |
Number of shares (thousands) |  |  |  |
Nonvested beginning balance (in shares) | 374 | 382 | 240 | 240
Granted (in shares) | 2 |  | 142 |
Forfeited (in shares) | (5) | (8) |  |
Nonvested ending Balance (in shares) | 371 | 374 | 382 | 371
Weighted average grant date fair value |  |  |  |
Nonvested weighted average exercise price beginning balance (in dollar per share) | $ 47.97 | $ 48.02 | $ 64.61 | $ 64.61
Granted the weighted average exercise price (in dollar per share) | 28.55 |  | 28.55 |
Forfeited weighted average exercise price (in dollar per share) | 73.11 | 50.17 |  |
Nonvested weighted average exercise price ending balance (in dollar per share) | $ 47.60 | $ 47.97 | $ 48.02 | $ 47.60
Relative Revenue Growth |  |  |  |
Number of shares (thousands) |  |  |  |
Nonvested beginning balance (in shares) | 374 | 382 | 240 | 240
Granted (in shares) | 2 |  | 142 |
Forfeited (in shares) | (5) | (8) |  |
Nonvested ending Balance (in shares) | 371 | 374 | 382 | 371
Weighted average grant date fair value |  |  |  |
Nonvested weighted average exercise price beginning balance (in dollar per share) | $ 41.52 | $ 41.54 | $ 48.52 | $ 48.52
Granted the weighted average exercise price (in dollar per share) | 37.77 |  | 34.11 |
Forfeited weighted average exercise price (in dollar per share) | 52.64 | 42.35 |  |
Nonvested weighted average exercise price ending balance (in dollar per share) | $ 41.35 | $ 41.52 | $ 41.54 | $ 41.35
Adjusted Earnings Per Share |  |  |  |
Number of shares (thousands) |  |  |  |
Nonvested beginning balance (in shares) | 112 | 115 | 0 | 0
Granted (in shares) | 2 |  | 115 |
Forfeited (in shares) | 0 | (3) |  |
Nonvested ending Balance (in shares) | 114 | 112 | 115 | 114
Weighted average grant date fair value |  |  |  |
Nonvested weighted average exercise price beginning balance (in dollar per share) | $ 34.11 | $ 34.11 | $ 0 | $ 0
Granted the weighted average exercise price (in dollar per share) | 37,770,000 |  | 34.11 |
Forfeited weighted average exercise price (in dollar per share) | 0 | 34.11 |  |
Nonvested weighted average exercise price ending balance (in dollar per share) | $ 34.16 | $ 34.11 | $ 34.11 | $ 34.16

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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 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=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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