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Employee Share Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of Share-Based Compensation Awards | Compensation expense for stock-based awards recognized during the three and six months ended June 30, 2019 and 2018 was as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Stock options |  | $ | 479 |  |  | $ | 1,030 |  |  | $ | 998 |  |  | $ | 1,548 |
Restricted stock awards |  |  | 1,153 |  |  |  | 1,383 |  |  |  | 2,082 |  |  |  | 2,302 |
Performance share units |  |  | 285 |  |  |  | — |  |  |  | 319 |  |  |  | — |
Total stock-based compensation expense |  | $ | 1,917 |  |  | $ | 2,413 |  |  | $ | 3,399 |  |  | $ | 3,850 |
Stock Award Activity | Stock Options and Restricted Stock Awards – The following table presents our stock options and restricted stock award activity during the six months ended June 30, 2019 (in thousands, except per share data):
|  | Stock Options |  |  | Restricted Stock 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 |  |  | 3,622 |  |  | $ | 11.97 |  |  |  | 632 |  |  | $ | 15.35 |
Granted |  |  | — |  |  | $ | — |  |  |  | 227 |  |  | $ | 19.78 |
Exercised or released |  |  | (378 | ) |  | $ | 8.05 |  |  |  | (282 | ) |  | $ | 13.76 |
Expired or canceled |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Outstanding at June 30, 2019 |  |  | 3,244 |  |  | $ | 12.43 |  |  |  | 577 |  |  | $ | 17.88 |
Exercisable at June 30, 2019 |  |  | 2,287 |  |  | $ | 10.65 |  |  |  |  |  |  |  |  |
| (1) | Represents weighted average market value of the shares; awards are granted at no cost to the recipients.
Performance Shares [Member] |
Stock Award Activity | The following table presents our PSU award activity during the six months ended June 30, 2019 (in thousands, except per share data):
|  | PSUs |  |  | Grant-Date Fair Value Per Unit |
Outstanding at beginning of year |  |  | — |  |  | $ | — |
Granted |  |  | 173 |  |  | $ | 19.82 |
Vested |  |  | — |  |  | $ | — |
Adjustments for performance results |  |  | — |  |  | $ | — |
Expired or cancelled |  |  | — |  |  | $ | — |
Outstanding at June 30, 2019 |  |  | 173 |  |  | $ | 19.82 |

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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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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