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Stock-Based Incentive Plans (Tables) | 9 Months Ended
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Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |
Share-based Compensation, Stock Options, Activity | Stock-based incentive plans compensation expense is as follows (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Service-based restricted stock units (“RSUs”) |  | $ | 4,410 |  |  | $ | 3,583 |  |  | $ | 13,139 |  |  | $ | 10,428 |
Service-based stock appreciation rights (“SARs”) |  | 3,211 |  |  | 2,896 |  |  | 9,185 |  |  | 7,804 |
Market performance-based restricted stock units |  | 814 |  |  | 757 |  |  | 2,745 |  |  | 2,146 |
Operating performance-based restricted stock units |  | (962) |  |  | 983 |  |  | 882 |  |  | 2,752 |
Employee share purchase plan |  | 337 |  |  | 312 |  |  | 894 |  |  | 997 |
Total stock-based compensation expense |  | $ | 7,810 |  |  | $ | 8,531 |  |  | $ | 26,845 |  |  | $ | 24,127 |
Stock-based compensation agreements issued during the nine months ended September 30, 2020, representing potential shares and their weighted average grant date fair values by type follows (shares in thousands, fair value in dollars):
|  | Nine Months Ended September 30, 2020
|  | Shares |  | Weighted Average Grant Date Fair Value
Service-based SARs |  | 1,133 |  |  | $ | 15.73 |
Service-based RSUs |  | 599 |  |  | $ | 44.42 |
Market performance-based RSUs |  | 93 |  |  | $ | 39.83 |
Operating performance-based RSUs |  | 93 |  |  | $ | 43.57 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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