Related Party Transactions (Management Agreement) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
First $250 million of Equity [Member]
Related Party Transaction [Line Items]
Annual management fee as a percent of equity	1.50%
Greater than $250 million but less than or equal to $500 million Equity [Member]
Related Party Transaction [Line Items]
Annual management fee as a percent of equity	1.25%
Equity threshold required to trigger allocation of overheads	$ 250,000,000
Greater than $500 million of Equity [Member]
Related Party Transaction [Line Items]
Annual management fee as a percent of equity	1.00%
Equity threshold required to trigger allocation of overheads	$ 500,000,000