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Earnings per Common Share Antidilutive Shares (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Common Class A [Member]
   
Antidilutive Shares [Line Items]    
Antidilutive shares 8,852 7,459
Common Class A [Member] | Stock Options [Member]
   
Antidilutive Shares [Line Items]    
Antidilutive shares 1,952 596
Common Class A [Member] | Restricted Stock Units (RSUs) [Member]
   
Antidilutive Shares [Line Items]    
Antidilutive shares 41 4
Common Class A [Member] | Convertible preferred stock [Member]
   
Antidilutive Shares [Line Items]    
Antidilutive shares 6,859 6,859
Common Class B [Member]
   
Antidilutive Shares [Line Items]    
Antidilutive shares 323 19
Common Class B [Member] | Stock Options [Member]
   
Antidilutive Shares [Line Items]    
Antidilutive shares 323 19