Series A Preferred Units (Details) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 31, 2013	Jun. 30, 2013	Jun. 30, 2013	Sep. 02, 2029	Dec. 31, 2012	Sep. 02, 2009
Series A Preferred Units disclosure [Abstract]
Common Units To Be Issued Upon Conversion			4,672,835
Temporary Equity, Shares Issued		4,371,586	4,371,586		4,371,586	4,371,586
Series A Preferred Units		$ 73,000,000	$ 73,000,000		$ 73,000,000
Series A Pref Units			0
Accretion of Series A Preferred Units			0
Redemption Amount for Series A Preferred Units				80,000,000
Quarterly Cash Distribution for Series A Preferred Units		$ 0.445
Conversion of Series A Preferred Units in July 2013	2,400,000
Total Conversion of Series A Preferred Units in July 2013	2,600,000