Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Details Textual)

v2.3.0.15
Segment Information (Details Textual) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Segment Reporting Information [Line Items]          
Total assets for the Company's Segment $ 1,388,056,000   $ 1,388,056,000   $ 1,232,220,000
Segment Information (Textual) [Abstract]          
Number of countries where the products are sold 78   78    
Primary Reporting Segment [Member]
         
Segment Reporting Information [Line Items]          
Total assets for the Company's Segment 1,305,900,000   1,305,900,000   1,162,100,000
China [Member]
         
Segment Reporting Information [Line Items]          
China salesperson compensation and service fee costs 25,200,000 24,000,000 70,700,000 64,400,000  
Total assets for the Company's Segment $ 82,200,000   $ 82,200,000   $ 70,100,000