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Employee Stock Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Awards | Compensation expense for stock-based awards recognized during the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30, |
| 2021 |  | 2020 |  | 2021 |  | 2020 |
Stock options | $ | 232 |  |  | $ | 367 |  |  | $ | 533 |  |  | $ | 788 |  |
Restricted stock units and awards | 1,445 |  |  | 1,324 |  |  | 2,826 |  |  | 2,495 |  |
Performance share units | 922 |  |  | 566 |  |  | 2,095 |  |  | 997 |  |
Total stock-based compensation expense | $ | 2,599 |  |  | $ | 2,257 |  |  | $ | 5,454 |  |  | $ | 4,280 |  |
Schedule of Stock Options, Restricted Stock Units and Awards, and Performance Share Units Award Activity | The following table presents our stock options and restricted stock units and awards activity during the six months ended June 30, 2021 (in thousands, except per share data):
| Stock Options |  | Restricted Stock Units and Awards |
| Number of Options |  | Weighted Average Exercise Price Per Share |  | Number of Shares |  | Weighted Average Grant-Date Fair Value (1) |
Outstanding at beginning of year | 1,820 |  |  | $ | 15.02 |  |  | 461 |  |  | $ | 21.03 |  |
Granted | — |  |  | $ | — |  |  | 174 |  |  | $ | 28.62 |  |
Exercised or released | (493) |  |  | $ | 11.05 |  |  | (246) |  |  | $ | 20.00 |  |
Expired or canceled | — |  |  | $ | — |  |  | — |  |  | $ | — |  |
Outstanding at June 30, 2021 | 1,327 |  |  | $ | 16.50 |  |  | 389 |  |  | $ | 25.07 |  |
Exercisable at June 30, 2021 | 1,179 |  |  | $ | 16.13 |  |  |  |  |  |
(1)Represents weighted average market value of the shares; awards are granted at no cost to the recipients. The following table presents our PSU award activity during the six months ended June 30, 2021 (in thousands, except per share data):
| Performance Share Units |  | Weighted Average Grant-Date Fair Value Per Unit (1) |
Outstanding at beginning of year | 307 |  |  | $ | 22.18 |  |
Granted | 140 |  |  | $ | 27.56 |  |
Vested | — |  |  | $ | — |  |
Adjustments for performance results | — |  |  | $ | — |  |
Canceled | — |  |  | $ | — |  |
Outstanding at June 30, 2021 | 447 |  |  | $ | 23.86 |  |
(1)Represents weighted average market value of the performance share units; PSUs are granted at no cost to the recipients.

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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 (e) -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 (c)(2) -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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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