Annual report pursuant to Section 13 and 15(d)

Segment Information (Details Textual)

v2.4.0.6
Segment Information (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2011
Country
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2011
Foreign Subsidiary [Member]
Dec. 31, 2010
Foreign Subsidiary [Member]
Dec. 31, 2011
Primary Reporting Segment [Member]
Dec. 31, 2010
Primary Reporting Segment [Member]
Dec. 31, 2011
China [Member]
Dec. 31, 2010
China [Member]
Dec. 31, 2009
China [Member]
Dec. 31, 2011
U.S [Member]
Dec. 31, 2010
U.S [Member]
Dec. 31, 2011
Foreign Country [Member]
Dec. 31, 2010
Foreign Country [Member]
Segment Reporting Information [Line Items]                              
China salesperson compensation and service fee costs                 $ 96,800,000 $ 87,300,000 $ 79,100,000        
Total assets for the Company's Segment 1,446,209,000 1,232,220,000         1,357,400,000 1,162,100,000 88,800,000 70,100,000          
Goodwill allocated to the Company's Segment 105,490,000 102,899,000 102,500,000       102,400,000 99,800,000 3,100,000 3,100,000          
Net property, plant and equipment located in the U.S. and in all foreign countries 193,703,000 177,427,000                   144,200,000 141,100,000 49,500,000 36,300,000
Deferred tax assets related to U.S and foreign countries 112,200,000 107,700,000                   65,400,000 72,900,000 46,800,000 34,800,000
Cash and cash equivalents 258,775,000 190,550,000 150,801,000 150,847,000 246,000,000 188,200,000                  
Total amount of cash held by foreign subsidiaries maintained or invested in U.S. dollars $ 9,200,000 $ 5,800,000                          
Segment Information (Textual) [Abstract]                              
Number of countries where the products are sold 79