v3.7.0.1
Earnings per Common Share Antidilutive Shares (Details) - Common Class A [Member] - shares
shares in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Antidilutive Shares [Line Items]    
Antidilutive shares 55 1,853
Stock Options [Member]    
Antidilutive Shares [Line Items]    
Antidilutive shares 55 326
Restricted Stock Units (RSUs) [Member]    
Antidilutive Shares [Line Items]    
Antidilutive shares 0 8
Convertible Preferred Stock [Member]    
Antidilutive Shares [Line Items]    
Antidilutive shares 0 1,519