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Other Current Assets
3 Months Ended
Mar. 31, 2012
Other Current Assets [Abstract]  
Schedule of Other Assets
Other Current Assets
Other current assets consist of the following (in thousands):  
 
March 31,
2012
 
December 31,
2011
Prepaid expenses
$
20,790

 
$
24,669

Interest and other receivables
27,076

 
16,297

Other current assets
9,745

 
8,192

 
$
57,611

 
$
49,158