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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Options Activity | A summary of the status of the Company’s stock options at December 31, 2017, together with changes during the periods then ended, is presented below:
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | average |  |  | Aggregate |
|  |  |  |  |  | average |  |  | remaining |  |  | intrinsic |
|  | Number |  |  | exercise |  |  | contractual |  |  | value |
|  | of options |  |  | price |  |  | term (years) |  |  | (in thousands) |
Outstanding at December 31, 2016 |  |  | 303,200 |  |  | $ | 17.89 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (10,800 | ) |  |  | 15.08 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2017 |  |  | 292,400 |  |  |  | 17.99 |  |  |  | 3.57 |  |  |  | 13,596 |
Exercisable at December 31, 2017 |  |  | 228,650 |  |  |  | 16.46 |  |  |  | 3.15 |  |  | $ | 10,982 |
Schedule of Restricted Stock Unit Activity | The following table presents restricted stock unit activity:
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
|  | Units |  |  | Fair Value |
Nonvested at December 31, 2016 |  |  | 228,875 |  |  | $ | 42.48 |
Granted |  |  | 81,792 |  |  |  | 57.29 |
Vested |  |  | (46,894 | ) |  |  | 43.66 |
Cancelled/Forfeited |  |  | (29,390 | ) |  |  | 43.71 |
Nonvested at December 31, 2017 |  |  | 234,383 |  |  | $ | 47.26 |

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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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