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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of activity of stock options and awards of shares and stock units | The following table summarizes activity regarding our stock options and awards of shares and stock units since December 31, 2014:
Stock Options |  | Restricted Stock Units
|  | Shares |  | Weighted Average Price |  |  |  | Shares |  | Weighted Average Price
Balance, December 31, 2014 |  | 566,774 |  |  | $ | 24.15 |  |  | Balance, December 31, 2014 |  | 634,298 |  |  | $ | 34.16 |
Granted |  | — |  |  | — |  |  | Granted |  | 241,274 |  |  | $ | 45.23 |
Expired |  | (30,000 | ) |  | $ | 12.09 |  |  | Forfeited |  | (3,587 | ) |  | $ | 29.56 |
Exercised |  | (230,048 | ) |  | $ | 26.71 |  |  | Vested |  | (266,497 | ) |  | $ | 32.17 |
Balance, December 31, 2015 |  | 306,726 |  |  | $ | 23.42 |  |  | Balance, December 31, 2015 |  | 605,488 |  |  | $ | 39.47 |
Granted |  | — |  |  | — |  |  | Granted |  | 191,936 |  |  | $ | 46.86 |
Expired |  | — |  |  | — |  |  | Forfeited |  | (965 | ) |  | $ | 43.13 |
Exercised |  | (163,726 | ) |  | $ | 23.73 |  |  | Vested |  | (304,171 | ) |  | $ | 35.29 |
Balance, December 31, 2016 |  | 143,000 |  |  | $ | 23.06 |  |  | Balance, December 31, 2016 |  | 492,288 |  |  | $ | 44.93 |
Granted |  | — |  |  | — |  |  | Granted |  | 198,179 |  |  | $ | 68.33 |
Expired |  | — |  |  | — |  |  | Forfeited |  | (1,200 | ) |  | $ | 60.68 |
Exercised |  | (50,000 | ) |  | $ | 20.42 |  |  | Vested |  | (180,395 | ) |  | $ | 44.57 |
Balance, December 31, 2017 |  | 93,000 |  |  | $ | 24.48 |  |  | Balance, December 31, 2017 |  | 508,872 |  |  | $ | 54.13 |
Summary of information about stock options | The following table summarizes information about our outstanding stock options as of December 31, 2017:
Stock Options Outstanding and Exercisable
Range of Exercise Prices |  | Number |  | Weighted Average Remaining Life |  | Weighted Average Exercise Price
$24.48 |  | 93,000 |  | 2.45 Years |  | $24.48

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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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