Annual report pursuant to Section 13 and 15(d)

Segment Information (Details Textual)

v2.4.0.6
Segment Information (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Information (Textual)      
Revenues from foreign operations $ 535.0 $ 256.1 $ 112.2
Property and equipment held in foreign countries $ 114.8 $ 94.0  
CANADA
     
Revenue, Major Customer [Line Items]      
Percentage of total revenue which were earned in Canada 97.00% 87.00% 84.00%