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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 Option Activity | A summary of the Company’s stock option activity as of December 31, 2015, and changes during the year then ended, is presented below:
| Number of Shares |  | Option Price Per Share |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2014 | 170,815 |  |  | $2.89 –$24.65 |  | $ | 14.84 |  |  |
Exercised | (51,936 | ) |  | 2.89 –24.65 |  | 18.71 |  |  |
Outstanding at December 31, 2015 | 118,879 |  |  | $2.89 –$24.65 |  | $ | 16.23 |  |  | $ | 1,528 |
Exercisable at December 31, 2015 | 118,879 |  |  | $2.89 –$24.65 |  | $ | 16.23 |  |  | $ | 1,528 |
Summary of Restricted Stock Units | A summary of the status of the Company’s restricted stock units and restricted stock awards as of December 31, 2015, and changes during the year then ended, is presented below:
| Non-Vested Shares |  | Weighted Average Grant Date Fair Value
Non-vested at December 31, 2014 | 1,102,281 |  |  | $ | 35.60 |
Awarded | 712,666 |  |  | $ | 42.21 |
Vested | (430,813 | ) |  | $ | 35.90 |
Cancelled/forfeited | (79,863 | ) |  | $ | 42.22 |
Non-vested at December 31, 2015 | 1,304,271 |  |  | $ | 38.71 |

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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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