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Redemption of Preferred Stock (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Excess of redemption value over carrying value of preferred shares subject to redemption   $ 6,015 $ 6,015
Class E Cumulative Redeemable Preferred Stock      
Preferred stock redeemed (in shares) | shares 8.8    
Preferred stock, dividend rate (as a percent) 6.75%    
Preferred stock, redemption price per share (in dollars per share) | $ / shares $ 25 $ 25 $ 25
Excess of redemption value over carrying value of preferred shares subject to redemption $ 6,000