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 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Equity attributable to noncontrolling interest        
Non-controlling interest, January 1     $ 37,631 $ 3,448
Non-controlling interest in subsidiaries (136) 80 209 (93)
Foreign currency translation adjustment     381 70
Capital contribution by noncontrolling interest     115 31,000
Non-controlling interest, June 30 $ 38,336 $ 34,425 $ 38,336 $ 34,425
Stockholder's Equity (Textuals) [Abstract]        
Certain Class B stockholders converted into Class A 13,640 852,225 13,640 1,014,105