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Stockholders' Equity and Equity Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2014
Summary of Unvested Restricted Common Stock Activity | Stock Incentive Plan. In May 2014, our stockholders approved an increase of 2.9 million shares authorized for issuance under the 2005 Stock Incentive Plan, from 15.8 million shares to 18.7 million shares. Stock-Based Awards. A summary of our unvested restricted common stock activity during the second quarter and six months ended June 30, 2014 is as follows (shares in thousands):
| Quarter Ended June 30, 2014 |  | Six Months Ended June 30, 2014
| Shares |  |  | Weighted- Average Grant Date Fair Value |  | Shares |  | Weighted- Average Grant Date Fair Value |
Unvested awards, beginning |  | 1,848 |  |  | $ | 21.21 |  |  | 1,922 |  |  | $ | 18.57 |
Awards granted |  | 18 |  |  |  | 25.09 |  |  | 650 |  |  |  | 26.28 |
Awards forfeited/cancelled |  | (21 | ) |  |  | 20.12 |  |  | (51 | ) |  |  | 20.32 |
Awards vested |  | (13 | ) |  |  | 21.03 |  |  | (689 | ) |  |  | 18.52 |
Unvested awards, ending |  | 1,832 |  |  | $ | 21.27 |  |  | 1,832 |  |  | $ | 21.27 |

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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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