Commitments and Contingent Liabilities Common Unit Compensation Plan for Non-Employee Directors (Details) (USD $)	3 Months Ended				12 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2011	Mar. 31, 2011 Mr. Lawrence [Member]	Jun. 30, 2011 Mr. Lawrence [Member]	Dec. 31, 2012 Mr. Lawrence [Member]	Dec. 31, 2011 Mr. Gardner [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					100,000
TIme subject to forefeiture restrictions expire					6 months
Rounded number of units directors will receive if units are elected in place of cash compensation					50
Number of cash compensation payments to directors per year					4
Number of non-employee directors					3	3
Non-employee director compensation	$ 200,000	$ 180,000	$ 180,000	$ 180,000				$ 1,518		$ 90,000
Value of units granted to non-employee director as compensation							$ 176,964
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures									2,450