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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2017
Stockholders' Equity Note [Abstract] |
Restricted share activity | Restricted and performance stock activity for the three months ended March 31, 2017 is summarized below:
| Restricted Shares |  | Performance Shares |  | Total |  | Weighted Average Grant Date Fair Value
Unvested balance as of December 31, 2016 | 577,244 |  |  | 345,656 |  |  | 922,900 |  |  | $ | 58.15 |
Granted | 351,214 |  |  | — |  |  | 351,214 |  |  | 49.51 |
Vested | (208,425 | ) |  | (107,320 | ) |  | (315,745 | ) |  | 51.88 |
Forfeited | (5,061 | ) |  | — |  |  | (5,061 | ) |  | 63.71 |
Unvested balance as of March 31, 2017 | 714,972 |  |  | 238,336 |  |  | 953,308 |  |  | 57.02 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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