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Equity Incentive Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of the activity of stock option awards | A summary of the activity of stock option awards issued and outstanding under Company plans is as follows for the six months ended June 30, 2018:
| Shares |  | Wtd. Avg. Exercise Price |  | Wtd. Avg. Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  |  |  | (in thousands)
Options outstanding at January 1, 2018 | 1,230 |  |  | $ | 25.02 |  |  | 7.33 |  | $ | 3,117 |
Options granted | 475 |  |  | 21.60 |  |  |  |  |
Options exercised | (77 | ) |  | 19.24 |  |  |  |  |
Options forfeited/canceled/expired | (67 | ) |  | 26.67 |  |  |  |  |
Options outstanding at June 30, 2018 | 1,561 |  |  | $ | 24.19 |  |  | 7.71 |  | $ | 7,376 |
Options vested and expected to vest at June 30, 2018 | 1,445 |  |  | $ | 24.20 |  |  | 7.58 |  | $ | 6,846 |
Options exercisable at June 30, 2018 | 688 |  |  | $ | 23.68 |  |  | 6.06 |  | $ | 3,629 |
Summary of the activity of restricted stock | A summary of the activity of restricted stock outstanding is as follows for the six months ended June 30, 2018:
| Shares |  | Wtd. Avg. Grant Date Fair Value
| (in thousands) |  |
Restricted stock outstanding at January 1, 2018 | 1,770 |  |  | $ | 30.47 |
Granted | 896 |  |  | 22.80 |
Vested | (568 | ) |  | 28.55 |
Forfeited/canceled | (28 | ) |  | 26.04 |
Restricted stock outstanding at June 30, 2018 | 2,070 |  |  | $ | 27.56 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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