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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Stock-Based Compensation |
Summary of the Company's restricted stock activity |
|  |  |  | Weighted Average |  | Aggregate |
|  | Shares |  | Grant‑Date Fair Value |  | Intrinsic‑Value |
December 31, 2014 |  | 1,102,385 |  | $ | 30.78 |  |  |  |
Granted |  | 295,148 |  |  | 47.98 |  |  |  |
Vested |  | (376,092) |  |  | 22.83 |  |  |  |
Forfeited |  | (39,706) |  |  | 37.39 |  |  |  |
December 31, 2015 |  | 981,735 |  | $ | 32.43 |  | $ | 41.6 |

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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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