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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Stock-Based Compensation Plans [Abstract] |
Changes in Outstanding Stock Options | The following is a summary of the changes in outstanding stock options for the years ended December 31, 2015 and 2014:
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (Years) |
Outstanding at December 31, 2013 |  |  | 16,875 |  |  | $ | 12.14 |  |  |  | 1.0 |
Expired |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (7,000 | ) |  |  | 13.76 |  |  |  | — |
Forfeited, other |  |  | — |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2014 |  |  | 9,875 |  |  |  | 10.99 |  |  |  | 0.4 |
Expired |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (9,875 | ) |  |  | 10.99 |  |  |  | — |
Forfeited, other |  |  | — |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2015 |  |  | — |  |  | $ | — |  |  |  | — |
Options exercisable at December 31, 2015 |  |  | — |  |  | $ | — |  |  |  | — |
Restricted and Performance-Based Share Activity | Our restricted and performance-based share activity was as follows for the years ended December 31, 2015 and 2014:
|  | Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Balance at December 31, 2013 |  |  | 630,600 |  |  | $ | 19.47 |
Granted |  |  | 256,443 |  |  |  | 32.22 |
Vested |  |  | (132,325 | ) |  |  | 15.50 |
Forfeited |  |  | (5,700 | ) |  |  | 18.77 |
Balance at December 31, 2014 |  |  | 749,018 |  |  |  | 24.62 |
Granted |  |  | 211,950 |  |  |  | 31.79 |
Vested |  |  | (192,768 | ) |  |  | 22.13 |
Forfeited |  |  | (9,650 | ) |  |  | 29.30 |
Balance at December 31, 2015 |  |  | 758,550 |  |  | $ | 27.19 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock and performance-based stock that were outstanding at the beginning and end of the year, and the number of restricted stock and performance-based stock that were granted, vested, or forfeited during the year. + References No definition available. + 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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