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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Equity attributable to non-controlling interest        
Non-controlling interest, January 1     $ 39,966 $ 37,631
Net earnings attributable to non-controlling interest 438 (136) 694 209
Foreign currency translation adjustment     83 381
Capital contribution by non-controlling interest     0 115
Non-controlling interest, June 30 $ 40,743 $ 38,336 $ 40,743 $ 38,336
Stockholder's Equity (Textual) [Abstract]        
Certain Class B stockholders converted into Class A 0 13,640 22,880 13,640