Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity (Details)

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Stockholder's Equity (Details) (USD $)
In Thousands, except Share data
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Equity attributable to noncontrolling interest        
Non-controlling interest, January 1     $ 37,631 $ 3,448
Non-controlling interest in subsidiaries 71 201 280 108
Foreign currency translation adjustment     244 241
Capital contribution by noncontrolling interest     115 31,000
Non-controlling interest, June 30 $ 38,270 $ 34,797 $ 38,270 $ 34,797
Stockholder's Equity (Textual) [Abstract]        
Certain Class B stockholders converted into Class A 0 34,900 13,640 1,049,005