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Equity Awards (Tables) | 9 Months Ended
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Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity | Information related to stock options at September 30, 2013 is as follows:
|  | Number of Options |  | Weighted Average Option Price |  | Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2013 |  | 675,665 |  |  | $ | 15.52 |  |  |  |  |
Exercised |  | (320,940 | ) |  | 21.25 |  |  |  |  |
Cancelled |  | — |  |  | — |  |  |  |  |
Expired |  | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2013 |  | 354,725 |  |  | $ | 10.33 |  |  | 4.2 |  | $ | 9,569,015 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | Information related to restricted shares at September 30, 2013 is as follows:
|  | Number of Unvested Restricted Shares |  | Weighted Average Grant Date Fair Value |  | Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2013 |  | 636,037 |  |  | $ | 22.02 |  |  |  |  |
Granted |  | 403,615 |  |  | 28.23 |  |  |  |  |
Vested |  | (352,236 | ) |  | 21.94 |  |  |  |  |
Cancelled |  | (4,516 | ) |  | 25.73 |  |  |  |  |
Outstanding at September 30, 2013 |  | 682,900 |  |  | $ | 25.71 |  |  | 1.6 |  | $ | 25,478,499 |

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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=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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