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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Restricted Stock Awards | A summary of our restricted stock awards from January 1, 2009 to December 31, 2011 is as follows:
| Number of Shares |  | Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2009 | 605,809 |  |  | $ | 13.02 |
Granted | 1,517,435 |  |  | 2.82 |
Forfeited | (7,184 | ) |  | 14.61 |
Vested | (396,684 | ) |  | 9.77 |
Unvested balance at December 31, 2009 | 1,719,376 |  |  | 4.76 |
Granted | 356,964 |  |  | 8.41 |
Additional shares from dividends | 46,206 |  |  | 9.57 |
Vested | (573,848 | ) |  | 5.19 |
Unvested balance at December 31, 2010 | 1,548,698 |  |  | 5.49 |
Granted | 308,486 |  |  | 11.54 |
Additional shares from dividends | 18,302 |  |  | 9.23 |
Forfeited | (17,560 | ) |  | 7.02 |
Vested | (847,799 | ) |  | 6.01 |
Unvested balance at December 31, 2011 | 1,010,127 |  |  | $ | 6.97 |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights | A summary of our MSU awards from January 1, 2010 to December 31, 2011 is as follows:
| Number of Units |  | Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2010 | — |  |  | $ | — |
Granted | 84,854 |  |  | 9.87 |
Unvested balance at December 31, 2010 | 84,854 |  |  | 9.87 |
Granted | 72,599 |  |  | 13.43 |
Additional units from dividends | 4,122 |  |  | 9.23 |
Unvested balance at December 31, 2011 | 161,575 |  |  | $ | 11.45 |

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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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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