Long-Term Incentive Plan Units (Narrative) (Details) (USD $)	3 Months Ended		79 Months Ended	4 Months Ended	79 Months Ended	3 Months Ended	79 Months Ended		3 Months Ended		79 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2007 Manager [Member] Long-Term Incentive Plan Units [Member]	Mar. 31, 2014 Manager [Member] Long-Term Incentive Plan Units [Member]	Mar. 31, 2014 Director [Member] Long-Term Incentive Plan Units [Member]	Mar. 31, 2014 Director [Member] Long-Term Incentive Plan Units [Member]	Mar. 31, 2014 Dedicated or partially dedicated personnel [Member] Long-Term Incentive Plan Units [Member]	Mar. 31, 2014 Non-Manager [Member] Long-Term Incentive Plan Units [Member]	Mar. 31, 2013 Non-Manager [Member] Long-Term Incentive Plan Units [Member]	Mar. 31, 2014 Non-Manager [Member] Long-Term Incentive Plan Units [Member]	Mar. 31, 2014 Minimum [Member] Dedicated or partially dedicated personnel [Member] Long-Term Incentive Plan Units [Member]	Mar. 31, 2014 Maximum [Member] Dedicated or partially dedicated personnel [Member] Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP units granted				375,000			29,562	18,272
Aggregate expense associated with Manager LTIP, Since inception					$ 8,600,000
Vesting period						1 year						1 year	2 years
Allocated Share-based Compensation Expense	63,000	42,000							63,000	42,000	800,000
LTIPs converted since inception			11,782
Amount transferred from share-based LTIP awards to Shareholders Equity			$ 200,000