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Equity (Details 2) (USD $)
 9 Months Ended 12 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
Sep. 30, 2014
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Sep. 30, 2013
Dec. 31, 2012
item
Dec. 31, 2013
Jul. 19, 2013
Shelf Registration [Member]
Sep. 30, 2014
Series C Preferred Stock [Member]
Sep. 30, 2013
Series C Preferred Stock [Member]
Sep. 30, 2014
Common Stock [Member]
Aug. 31, 2014
Common Stock [Member]
Jul. 31, 2014
Common Stock [Member]
Jun. 30, 2014
Common Stock [Member]
May 31, 2014
Common Stock [Member]
Apr. 30, 2014
Common Stock [Member]
Mar. 31, 2014
Common Stock [Member]
Feb. 28, 2014
Common Stock [Member]
Jan. 31, 2014
Common Stock [Member]
Sep. 30, 2013
Common Stock [Member]
Aug. 31, 2013
Common Stock [Member]
Jul. 31, 2013
Common Stock [Member]
Jun. 30, 2013
Common Stock [Member]
May 31, 2013
Common Stock [Member]
Apr. 30, 2013
Common Stock [Member]
Mar. 31, 2013
Common Stock [Member]
Feb. 28, 2013
Common Stock [Member]
Jan. 31, 2013
Common Stock [Member]
Sep. 30, 2014
Common Stock [Member]
Sep. 30, 2013
Common Stock [Member]
Oct. 31, 2014
Common Stock [Member]
Subsequent Event [Member]
Sep. 30, 2013
Common Stock [Member]
Equity Distribution Agreement [Member]
Dec. 31, 2013
Common Stock [Member]
Equity Distribution Agreement [Member]
Sep. 30, 2013
Common Stock [Member]
Underwritten Public Offering [Member]
Equity                                                              
Shares outstanding 2,000,000     2,000,000   2,000,000                                                  
Dividend Rate (as a percent)           8.50%                                                  
Number of shares of common stock to be issued upon conversion           2,000,000                                                  
Conversion price per share           $ 19.25                                                  
Total shares reserved for issuance of common stock related to the conversion of preferred stock           2,000,000                                                  
Number of shares repurchased                                                   200 600        
Maximum aggregate offering price of shares authorized for issuance under terminated agreement                                                         $ 85,686,000    
Shares common stock sold                                                         126,742   4,025,000
Net proceeds                                                         4,895,000   171,365,000
Reclassification of accumulated costs to additional paid in capital                                                           662,000  
Maximum offering capacity under shelf registration statement         800,000,000                                                    
Non-controlling Interests                                                              
Number of limited partners 0                                                            
Number of limited partnerships     1                                                        
Limited partnership, conversion basis     1                                                        
Payment of accrued distributions to former limited partners   7,000                                                          
Dividend Distributions                                                              
Declared 55,729,000 48,363,000       2,454,000 2,454,000 53,275,000                 45,909,000                 53,275,000 45,909,000        
Paid 55,729,000 48,363,000       2,454,000 2,454,000                                     53,275,000 45,909,000        
Cash dividend declared per common share per month (in dollars per share)               $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.155            
Cash dividend paid per common share per month (in dollars per share)               $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.155            
Cash dividend declared per common share per month (in dollars per share)                                                       $ 0.17      
Sale price of common stock (in dollars per share)                                                             $ 44.50
Fees and costs                                                             7,748,000
Accumulated other comprehensive income                                                              
Accumulated other comprehensive income $ 91,000     $ 117,000