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Subsequent Events
6 Months Ended
Jun. 30, 2011
Subsequent Events [Abstract]  
Subsequent Events
18.       Subsequent Events
 
In July 2011, we declared the following dividends, which will be paid in August 2011:

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$0.144875 per share to our common stockholders;
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$0.1536459 per share to our Class D preferred stockholders; and
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$0.140625 per share to our Class E preferred stockholders.