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Redeemable Noncontrolling Interests And Subsidiary Acquisitions (Tables)
12 Months Ended
Dec. 31, 2012
Business Acquisition, Entity Acquired and Reason for Acquisition [Abstract]  
Redeemable Noncontrolling Interests
 
2012
 
2011
Previous owners of Cadence Network
$

 
$
38,893

Stock options and other outstanding redeemable stock
4,938

 
12,916

Total redeemable noncontrolling interests
$
4,938

 
$
51,809