Long-Term Incentive Plan Units (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		70 Months Ended		4 Months Ended	70 Months Ended		3 Months Ended		6 Months Ended		70 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2013 Independent Directors [Member] Long-Term Incentive Plan Units [Member]	Dec. 31, 2007 Manager [Member] Long-Term Incentive Plan Units [Member]	Jun. 30, 2013 Manager [Member] Long-Term Incentive Plan Units [Member]	Jun. 30, 2013 Dedicated Personnel [Member] Long-Term Incentive Plan Units [Member]	Jun. 30, 2013 Non-Manager [Member] Long-Term Incentive Plan Units [Member]	Jun. 30, 2012 Non-Manager [Member] Long-Term Incentive Plan Units [Member]	Jun. 30, 2013 Non-Manager [Member] Long-Term Incentive Plan Units [Member]	Jun. 30, 2012 Non-Manager [Member] Long-Term Incentive Plan Units [Member]	Jun. 30, 2013 Non-Manager [Member] Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP units granted						24,096	375,000		8,000
Aggregate expense associated with Manager LTIP, Since inception								$ 8,600,000
Vesting period												1 year
Allocated Share-based Compensation Expense	43,000	30,000	85,000	58,000						43,000	30,000	85,000	58,000	600,000
Common shares issued in connection with conversion since inception					10,000
Amount transferred from share-based LTIP awards to Shareholders Equity					$ 200,000