Consolidated and Combined Balance Sheets (Parenthetical)	Jun. 30, 2011	Dec. 31, 2010
Preferred, units authorized	0	500,000
Common, units authorized	0	500,000
Common, units issued	0	337,500
Common, units outstanding	0	337,500
Common, shares authorized	80,000,000	0
Common, shares issued	21,202,614	0
Common, shares outstanding	21,202,614	0
Series A Preferred Units [Member]
Preferred, units issued	0	90,796
Preferred, units outstanding	0	90,796
Series B Preferred Units [Member]
Preferred, units issued	0	25,000
Preferred, units outstanding	0	25,000
Series C Preferred Units [Member]
Preferred, units issued	0	70,000
Preferred, units outstanding	0	70,000
Series D Preferred Units [Member]
Preferred, units issued	0	7,000
Preferred, units outstanding	0	7,000
Series E Preferred Units [Member]
Preferred, units issued	0	73,000
Preferred, units outstanding	0	73,000