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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Awards
A summary of our restricted stock awards from January 1, 2010 to December 31, 2012 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2010
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

Granted
365,599

 
9.84

Additional shares from dividends
8,507

 
10.07

Forfeited
(11,563
)
 
10.05

Vested
(696,559
)
 
5.39

Unvested balance at December 31, 2012
676,111

 
$
10.10
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
A summary of our MSU awards from January 1, 2010 to December 31, 2012 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

Granted
89,990

 
11.14

Additional units from dividends
7,277

 
10.18

Unvested balance at December 31, 2012
258,842

 
$
11.31