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Stock Incentive Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Awards
A summary of our restricted stock awards from January 1, 2013 to March 31, 2013 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2013
676,111

 
$
10.10

Granted
269,826

 
9.08

Additional shares from dividends
1,040

 
9.30

Forfeited
(1,514
)
 
9.98

Vested
(339,069
)
 
9.86

Unvested balance at March 31, 2013
606,394

 
$
9.78
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
A summary of our MSUs from January 1, 2013 to March 31, 2013 is as follows:
 
Number of
Units
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2013
258,842

 
$
11.31

Additional units from dividends
2,225

 
9.30

Vested
(90,620
)
 
9.87

Unvested balance at March 31, 2013
170,447

 
$
12.05
Schedule of Nonvested Performance-based Units Activity
A summary of our PSUs from January 1, 2013 to March 31, 2013 is as follows:
 
Number of
Units
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2013
—

 
$
—

Granted
219,895

 
9.55

Unvested balance at March 31, 2013
219,895

 
$
9.55