Earnings per Share Increase in Weighted Average Basic Shares (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Class A common shares [Member]
Weighted average shares impact resulting from offerings	3,791,004	453,272	3,791,004	152,194
Series A-1 Preferred Stock [Member]
Weighted average shares impact resulting from conversion of Preferred Stock	5,984,232	0	5,019,740	0
Tangible Equity Units [Member]
Weighted average shares issuable upon settlement of the prepaid stock purchase contract component of the TEUs	2,841,650	411,307	2,841,650	138,103