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Stock Incentive Plans (Tables)
 12 Months Ended
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