v3.2.0.727
Earnings per Common Share - Antidilutive Shares (Details) - Common Class A [Member] - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Antidilutive Shares [Line Items]        
Antidilutive shares 2,397 6,099 2,401 6,654
Stock Options [Member]        
Antidilutive Shares [Line Items]        
Antidilutive shares 794 673 789 608
Restricted Stock Units (RSUs) [Member]        
Antidilutive Shares [Line Items]        
Antidilutive shares 85 57 96 35
Convertible preferred stock [Member]        
Antidilutive Shares [Line Items]        
Antidilutive shares 1,518 5,369 1,516 6,011