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, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Equity attributable to non-controlling interest    
Non-controlling interest, January 1 $ 39,966 $ 37,631
Non-controlling interest in subsidiaries 256 345
Foreign currency translation adjustment 153 271
Capital contribution by non-controlling interest 0 115
Non-controlling interest, March 31 $ 40,375 $ 38,362
Stockholder's Equity (Textual) [Abstract]    
Certain Class B stockholders converted into Class A 22,880 0