Base Management Fee And Incentive Fee (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Base Management Fee And Incentive Fee [Abstract]
Annual base management fee percentage			1.50%
Management fee description			The Manager receives an annual base management fee in an amount equal to 1.50% per annum of the Company's shareholders' equity as of the end of each fiscal quarter (before deductions for base management fee and incentive fee payable with respect to such fiscal quarter). The base management fee is payable quarterly in arrears.
Base management fee	$ 1,913	$ 1,418	$ 4,901	$ 4,347
Incentive fee rate			25.00%
Incentive fees arrangement			The Manager is entitled to receive a quarterly incentive fee equal to the positive excess of (i) the product of (A) 25% and (B) the excess of (1) Adjusted Net Income (described below) for the Incentive Calculation Period (which means such fiscal quarter and the immediately preceding three fiscal quarters) over (2) the sum of the Hurdle Amounts (described below) for the Incentive Calculation Period, over (ii) the sum of the incentive fees already paid or payable for each fiscal quarter in the Incentive Calculation Period preceding such fiscal quarter. For purposes of calculating the incentive fee, "Adjusted Net Income," for the Incentive Calculation Period means the net increase in shareholders' equity from operations, after all base management fees but before any incentive fees for such period, and excluding non-cash equity compensation expenses for such period as reduced by any Loss Carryforward (as described below) as of the end of the fiscal quarter preceding the Incentive Calculation Period. For purposes of calculating the incentive fee, the "Loss Carryforward" as of the end of any fiscal quarter is calculated by determining the excess, if any, of (1) the Loss Carryforward as of the end of the immediately preceding fiscal quarter over (2) the net increase in shareholders' equity from operations (expressed as a positive number) or net decrease in shareholders' equity from operations (expressed as a negative number) for such fiscal quarter. As of September 30, 2012, there was no Loss Carryforward. For purposes of calculating the incentive fee, the "Hurdle Amount" means, with respect to any fiscal quarter, the product of (i) one-fourth of the greater of (A) 9% and (B) 3% plus the ten-year U.S. Treasury rate for such fiscal quarter, (ii) the sum of (A) the weighted average gross proceeds per share of all our common share issuances up to the end of such fiscal quarter, with each issuance weighted by both the number of shares issued in such issuance and the number of days that such issued shares were outstanding during such fiscal quarter, using a first-in first-out basis of accounting (i.e., attributing any share repurchases to the earliest issuances first) and (B) the result obtained by dividing (I) retained earnings attributable to common shares at the beginning of such fiscal quarter by (II) the average number of common shares outstanding for each day during such fiscal quarter, and (iii) the average number of common shares and LTIP units outstanding for each day during such fiscal quarter. For purposes of determining the Hurdle Amount, issuances of common shares (a) as equity incentive awards, (b) to the Manager as part of its base management fee or incentive fee and (c) to the Manager or any of its affiliates in privately negotiated transactions, are excluded from the calculation. The payment of the incentive fee will be in a combination of common shares and cash, provided that at least 10% of any quarterly payment will be made in common shares.
Incentive fee hurdle rate fixed			9.00%
Incentive fee hurdle rate floating			3.00%
Minimum percentage of incentive fee to be paid in share			10.00%
Incentive fee	$ 9,491	$ 0	$ 11,802	$ 612