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Summary of Significant Accounting Policies (Details 9)
 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Series D Cumulative Redeemable Preferred Stock      
Dividend rate (as a percent) 8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		 8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		  
Series A Cumulative Redeemable Preferred Stock      
Dividend rate (as a percent)     8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember