Income Taxes Summary of the Average Taxable Nature of Dividends (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Common [Member]	Dec. 31, 2012 Common [Member]	Dec. 31, 2011 Common [Member]	Dec. 31, 2013 Common [Member] Ordinary Income [Member]	Dec. 31, 2012 Common [Member] Ordinary Income [Member]	Dec. 31, 2011 Common [Member] Ordinary Income [Member]	Dec. 31, 2013 Common [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2012 Common [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2011 Common [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2013 Common [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2012 Common [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2011 Common [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2013 Common [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2012 Common [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2011 Common [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2013 Common [Member] Return of Capital [Member]	Dec. 31, 2012 Common [Member] Return of Capital [Member]	Dec. 31, 2011 Common [Member] Return of Capital [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2012 Series B Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2011 Series B Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member]	Dec. 31, 2012 Series B Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member]	Dec. 31, 2011 Series B Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2012 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2011 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2012 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2011 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2012 Series B Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2011 Series B Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member]	Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member]	Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member]	Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] Return of Capital [Member]	Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] Return of Capital [Member]	Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] Return of Capital [Member]	Dec. 31, 2013 Series D Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2013 Series D Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member]	Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member]	Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member]	Dec. 31, 2013 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member]	Dec. 31, 2013 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member]	Dec. 31, 2013 Series D Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member]	Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member]
Income Tax Contingency [Line Items]
Allocation of Dividend Payments	$ 0.349355	$ 0.12252
Total dividends per share, common			$ 0.60	$ 0.525	$ 0.46
Total dividends per share, preferred																					$ 0	$ 1.341667	$ 2.0125													$ 3.25	$ 3.25	$ 3.25																$ 1.043368	$ 1.8875	$ 1.76498
Taxable percentage allocation on dividends			100.00%	100.00%	100.00%	35.53%	95.68%	47.33%	4.11%	0.99%	1.11%	2.09%	0.00%	0.00%	0.00%	0.00%	0.00%	58.27%	3.33%	51.56%	0.00%	100.00%	100.00%	0.00%	98.98%	97.70%	0.00%	1.02%	2.30%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	100.00%	100.00%	100.00%	85.14%	98.98%	97.70%	9.85%	1.02%	2.30%	5.01%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	100.00%	100.00%	100.00%	85.14%	98.98%	97.70%	9.85%	1.02%	2.30%	5.01%	0.00%	0.00%	0.00%	0.00%	0.00%