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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity [Abstract] |
Stock option and restricted stock activity | The following table summarizes stock option and restricted stock activity for the Plans:
|  |  |  |  | Stock Options |  |  | Restricted Shares |
|  | Shares Available for Grant |  |  | Shares |  |  | Weighted Average Exercise Price Per Share ($) |  |  | Shares |  |  | Weighted Average Exercise Price Per Share ($) |
Balance January 1, 2015 |  |  | 996,127 |  |  |  | 951,079 |  |  | $ | 37.46 |  |  |  | 175,488 |  |  | $ | 50.56 |
Authorized |  |  | 880,000 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Granted |  |  | (455,275 | ) |  |  | 238,773 |  |  |  | 60.40 |  |  |  | 216,502 |  |  |  | 60.32 |
Exercised/vested |  |  | - |  |  |  | (74,839 | ) |  |  | 33.12 |  |  |  | (59,801 | ) |  |  | 47.51 |
Canceled |  |  | 71,113 |  |  |  | (23,169 | ) |  |  | 60.22 |  |  |  | (47,944 | ) |  |  | 51.43 |
Balance December 31, 2015 |  |  | 1,491,965 |  |  |  | 1,091,844 |  |  |  | 42.29 |  |  |  | 284,245 |  |  |  | 58.63 |
Granted |  |  | (538,787 | ) |  |  | 383,622 |  |  |  | 38.59 |  |  |  | 155,165 |  |  |  | 38.37 |
Exercised/vested |  |  | - |  |  |  | (150,944 | ) |  |  | 36.66 |  |  |  | (88,746 | ) |  |  | 57.38 |
Canceled |  |  | 249,248 |  |  |  | (125,797 | ) |  |  | 43.78 |  |  |  | (123,451 | ) |  |  | 50.72 |
Balance December 31, 2016 |  |  | 1,202,426 |  |  |  | 1,198,725 |  |  |  | 41.66 |  |  |  | 227,213 |  |  |  | 49.57 |
Granted |  |  | (257,072 | ) |  |  | 187,533 |  |  |  | 77.99 |  |  |  | 69,539 |  |  |  | 78.00 |
Exercised/vested |  |  | - |  |  |  | (353,636 | ) |  |  | 41.56 |  |  |  | (61,274 | ) |  |  | 52.51 |
Canceled |  |  | 91,151 |  |  |  | (35,783 | ) |  |  | 50.47 |  |  |  | (55,368 | ) |  |  | 52.74 |
Balance December 31, 2017 |  |  | 1,036,505 |  |  |  | 996,839 |  |  |  | 48.21 |  |  |  | 180,110 |  |  |  | 58.57 |

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- Definition Tabular disclosure for share-based compensation 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 (c)(2) -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 (d) -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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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