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Equity Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Recognized compensation expenses | The Company recognized compensation expense related to the Company plans for the years ended December 31, 2017, 2016 and 2015 as follows (in thousands):
|  | 2017 |  | 2016 |  | 2015
Stock option plan expense |  | $ | 1,305 |  |  | $ | 538 |  |  | $ | 727 |
Restricted stock expense |  | $ | 18,539 |  |  | $ | 12,235 |  |  | $ | 10,982 |
Summary of the activity of stock option awards | A summary of the activity of the Company’s stock options plans is presented below:
|  | Shares |  | Wtd. Avg. Exercise Price |  | Wtd. Avg. Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
|  | (In thousands) |  |  |  |  |  | (In thousands)
Options outstanding at December 31, 2016 |  | 1,211 |  |  | $ | 20.65 |  |  | 7.14 |  | $ | 5,466 |
Granted |  | 462 |  |  | 32.30 |  |  |  |  |
Exercised |  | (360 | ) |  | 19.11 |  |  |  |  |
Forfeited/Canceled |  | (83 | ) |  | 27.41 |  |  |  |  |
Options outstanding at December 31, 2017 |  | 1,230 |  |  | $ | 25.02 |  |  | 7.33 |  | $ | 3,117 |
Options vested and expected to vest at December 31, 2017 |  | 1,165 |  |  | $ | 24.84 |  |  | 7.25 |  | $ | 3,042 |
Options exercisable at December 31, 2017 |  | 523 |  |  | $ | 22.04 |  |  | 5.93 |  | $ | 2,174 |
The aggregate intrinsic value in the table above represents the total pretax intrinsic value (i.e., the difference between the Company’s closing stock price on the last trading day of fiscal year 2017 and the exercise price, times the number of shares that are “in the money”) that would have been received by the option holders had all option holders exercised their options on December 31, 2017. This amount changes based on the fair value of the Company’s stock. The following table summarizes information relative to stock option activity during the years ended December 31, 2017, 2016 and 2015 (in thousands):
|  | 2017 |  | 2016 |  | 2015
Intrinsic value of options exercised |  | $ | 4,126 |  |  | $ | 1,671 |  |  | $ | 2,000 |
Fair value of shares vested |  | $ | 373 |  |  | $ | 518 |  |  | $ | 1,314 |
Exercise prices and related information of stock option outstanding | The following table summarizes information about the exercise prices and related information of stock options outstanding under the Company plans at December 31, 2017:
|  | Options Outstanding |  | Options Exercisable
Exercise Prices |  | Number Outstanding |  | Wtd. Avg. Remaining Contractual Life |  | Wtd. Avg. Exercise Price |  | Number Exercisable |  | Wtd. Avg. Remaining Contractual Life |  | Wtd. Avg. Exercise Price
|  | (In thousands) |  |  |  |  |  |  |  |  |  |
0-18.23 |  | 185 |  |  | 3.22 |  | $ | 13.97 |  |  | 185 |  |  | 3.22 |  | $ | 13.97 |
18.24-22.26 |  | 392 |  |  | 7.52 |  | $ | 20.18 |  |  | 133 |  |  | 6.92 |  | $ | 20.62 |
22.27-29.39 |  | 233 |  |  | 7.02 |  | $ | 28.77 |  |  | 120 |  |  | 6.87 |  | $ | 28.77 |
29.40-43.15 |  | 420 |  |  | 9.12 |  | $ | 32.27 |  |  | 85 |  |  | 8.94 |  | $ | 32.27 |
Total |  | 1,230 |  |  | 7.33 |  | $ | 25.02 |  |  | 523 |  |  | 5.93 |  | $ | 22.04 |
Status of non - vested stock options | The following table summarizes the status of non-vested stock options as of December 31, 2017 and 2016, and changes during the year ending December 31, 2017:
|  | Number of Shares |  | Wtd. Avg. Grant Date Fair Value
|  | (In thousands) |  |
Options non-vested at December 31, 2016 |  | 590 |  |  | $ | 1.93 |
Granted |  | 462 |  |  | 5.91 |
Vested |  | (262 | ) |  | 2.01 |
Forfeited |  | (83 | ) |  | 3.87 |
Options non-vested at December 31, 2017 |  | 707 |  |  | $ | 3.93 |
Summary of the activity of restricted stock | The following table summarizes the status of restricted stock awards as of December 31, 2017 and 2016, and changes during the year ended December 31, 2017:
|  | Shares |  | Wtd. Avg. Grant date Fair value
|  | (In thousands) |  |
Restricted stock outstanding at December 31, 2016 |  | 1,345 |  |  | $ | 24.37 |
Granted |  | 933 |  |  | 35.31 |
Vested |  | (442 | ) |  | 23.23 |
Forfeited/Canceled |  | (66 | ) |  | 26.89 |
Restricted stock outstanding at December 31, 2017 |  | 1,770 |  |  | $ | 30.47 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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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