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Other Current Assets
 6 Months Ended
Jun. 30, 2012
Other Current Assets [Abstract]  
Schedule of Other Current Assets
Other Current Assets
Other current assets consist of the following (in thousands):  
 
June 30,
2012
 
December 31,
2011
Prepaid expenses
$
17,077

 
$
24,669

Interest and other receivables
6,582

 
16,297

Other current assets
9,950

 
8,192

 
$
33,609

 
$
49,158