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Stock Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2013 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2013
676,111

 
$
10.10

Granted
297,838

 
9.17

Additional shares from dividends
1,040

 
9.30

Forfeited
(16,934
)
 
9.65

Vested
(400,722
)
 
9.94

Unvested balance at June 30, 2013
557,333

 
$
9.74
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
A summary of our MSUs from January 1, 2013 to June 30, 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
3,630

 
9.69

Vested
(90,620
)
 
9.86

Unvested balance at June 30, 2013
171,852

 
$
12.04
Schedule of Nonvested Performance-based Units Activity
A summary of our PSUs from January 1, 2013 to June 30, 2013 is as follows:
 
Number of
Units
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2013
—

 
$
—

Granted
217,949

 
9.64

Additional units from dividends
1,618

 
10.31

Unvested balance at June 30, 2013
219,567

 
$
9.64