Amounts Incurred for Management Fee and Reimbursable Expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Related Party Transaction [Line Items]
Management fee	$ 4,144	$ 4,714	$ 8,298	$ 9,434
Reimbursable expenses	876	589	1,688	1,168
Total Expenses	5,020	5,303	9,986	10,602
Share based compensation	$ 842	$ 627	$ 1,702	$ 1,256