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Stockholders' Equity and Equity Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2016
Stockholders Equity Note [Abstract] |
Summary of Unvested Restricted Common Stock Activity | Stock-Based Awards. A summary of our unvested restricted common stock activity during the third quarter and nine months ended is as follows (shares in thousands):
|  | Quarter Ended |  |  | Nine Months Ended |
|  | September 30, 2016 |  |  | September 30, 2016 |
|  | Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Shares |  |  | Weighted- Average Grant Date Fair Value |
Unvested awards, beginning |  |  | 1,744 |  |  | $ | 30.51 |  |  |  | 2,124 |  |  | $ | 26.03 |
Awards granted |  |  | 39 |  |  |  | 42.47 |  |  |  | 523 |  |  |  | 39.06 |
Awards forfeited/cancelled |  |  | (116 | ) |  |  | 31.04 |  |  |  | (278 | ) |  |  | 29.63 |
Awards vested |  |  | (230 | ) |  |  | 27.09 |  |  |  | (932 | ) |  |  | 24.08 |
Unvested awards, ending |  |  | 1,437 |  |  | $ | 31.34 |  |  |  | 1,437 |  |  | $ | 31.34 |

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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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