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Redeemable Noncontrolling Interest (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of redeemable noncontrolling interests      
Balance, beginning of period $ 3,863    
Stock based compensation 30,102 17,344 7,183
Purchases of subsidiary shares at fair value (22,300)    
Balance, end of period 0 3,863  
Noncontrolling interests [Member]
     
Reconciliation of redeemable noncontrolling interests      
Balance, beginning of period 3,863 2,637  
Net income attributable to noncontrolling interests 519 114  
Fair value adjustments 14,617 571  
Stock based compensation 3,305 541  
Purchases of subsidiary shares at fair value (22,304)    
Balance, end of period    $ 3,863