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Comprehensive Income (Tables)
9 Months Ended
Sep. 30, 2011
Comprehensive Income [Abstract] 
Schedule of Comprehensive Income (Loss) [Table Text Block]
Comprehensive income for the three and nine months ended September 30, 2011 and 2010 is detailed below.

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2011
 
2010
 
2011
 
2010
 
(in thousands)
Net income
$
72,614

 
$
21,205

 
$
108,295

 
$
46,063

Unrealized gain (loss) on available for sale securities
(20
)
 
80

 
—

 
61

Foreign currency translation adjustment
(817
)
 
79

 
(947
)
 
126

Comprehensive income
$
71,777

 
$
21,364

 
$
107,348

 
$
46,250