Income Taxes (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Income Tax [Line Items]
Income tax (expense) benefit	$ 3,251	$ 1,226	$ 1,866
Estimated combined federal and state statutory tax rate	37.50%
Operating Partnership [Member]
Schedule of Income Tax [Line Items]
Income tax (expense) benefit	$ 200	$ 200	$ 400
Series A Preferred Stock [Member]
Schedule of Income Tax [Line Items]
Prior year distributions carryforward as current year distribution	$ 0.4261
Series B Preferred Stock [Member]
Schedule of Income Tax [Line Items]
Prior year distributions carryforward as current year distribution	$ 0.4328
Series C Preferred Stock [Member]
Schedule of Income Tax [Line Items]
Prior year distributions carryforward as current year distribution	$ 0.3517
Common Shares [Member]
Schedule of Income Tax [Line Items]
Current year distributions carryforward to next year distributions	$ 0.1692