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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2012:
Stock Options |  | Restricted Stock Units
|  | Shares |  | Weighted Average Price |  |  |  | Shares |  | Weighted Average Price
Balance, December 31, 2012 |  | 1,796,377 |  |  | $ | 17.15 |  |  | Balance, December 31, 2012 |  | 588,907 |  |  | $ | 28.56 |
Granted |  | — |  |  | — |  |  | Granted |  | 192,617 |  |  | $ | 36.26 |
Expired |  | — |  |  | — |  |  | Forfeited |  | (15,298 | ) |  | $ | 29.38 |
Exercised |  | (485,680 | ) |  | $ | 14.55 |  |  | Vested |  | (155,423 | ) |  | $ | 27.77 |
Balance, December 31, 2013 |  | 1,310,697 |  |  | $ | 18.12 |  |  | Balance, December 31, 2013 |  | 610,803 |  |  | $ | 31.17 |
Granted |  | — |  |  | — |  |  | Granted |  | 176,418 |  |  | $ | 43.06 |
Expired |  | — |  |  | — |  |  | Forfeited |  | (500 | ) |  | $ | 43.76 |
Exercised |  | (743,923 | ) |  | $ | 13.52 |  |  | Vested |  | (152,423 | ) |  | $ | 32.46 |
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 |
Summary of information about stock options | The following table summarizes information about our stock options as of December 31, 2015:
Stock Options Outstanding and Exercisable
Range of Exercise Prices |  | Number |  | Weighted Average Remaining Life |  | Weighted Average Exercise Price
$20.42 - $20.54 |  | 110,000 |  | 1.41 Years |  | $20.43
$22.52 - $24.48 |  | 140,000 |  | 3.31 Years |  | $23.92
$27.39 - $29.26 |  | 56,726 |  | 0.54 Years |  | $27.96

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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=6415400&loc=d3e5070-113901 + Details
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