Earnings Per Share (Details Textual) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restricted Stock and Class A Common Units [Member]
Earnings Per Share (Textual) [Abstract]
Anti-dilutive securities excluded from computation of earnings per share	3,908,518		4,110,705
Convertible securities [Member]
Earnings Per Share (Textual) [Abstract]
Anti-dilutive securities excluded from computation of earnings per share			4,720,604
Dilutive options, restricted stock, performance shares and convertible securities [Member]
Earnings Per Share (Textual) [Abstract]
Anti-dilutive securities excluded from computation of earnings per share		37,140,789		37,425,371
Weighted-average options, restricted stock and performance shares [Member]
Earnings Per Share (Textual) [Abstract]
Anti-dilutive securities excluded from computation of earnings per share	1,803,486	3,974,932	2,123,933	3,585,274