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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock-Based Compensation Expense | Stock-based compensation expense is summarized as follows:
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
($ in thousands) |  |  |  |  |
Stock-based compensation expense | $ | 11,863 |  |  | $ | 9,778 |  |  | $ | 7,960 |
Summary of Restricted Stock Units Activity | RSU activity for the year ended December 31, 2015 is summarized as follows:
| Number of shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2014 | 179,936 |  |  | $ | 143.25 |
Granted | 118,380 |  |  | $ | 134.37 |
Forfeited | (19,289 | ) |  | $ | 142.41 |
Settled | (87,410 | ) |  | $ | 102.00 |
Outstanding at December 31, 2015 | 191,617 |  |  | $ | 156.66 |
Summary of Stock Option Activity | Stock option activity for the year ended December 31, 2015 is summarized as follows:
| Number of shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2014 | 162,824 |  |  | $ | 18.79 |
Granted | — |  |  | $ | — |
Exercised | (6,188 | ) |  | $ | 19.04 |
Forfeited | — |  |  | $ | — |
Outstanding at December 31, 2015 | 156,636 |  |  | $ | 18.78 |
Vested and exercisable at December 31, 2015 | 156,636 |  |  | $ | 18.78 |

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