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Subsequent Events (Details)
$ / shares in Units, $ in Thousands
2 Months Ended 12 Months Ended
Feb. 23, 2016
$ / shares
Aug. 05, 2015
$ / shares
Feb. 23, 2016
USD ($)
property
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Dec. 31, 2013
USD ($)
$ / shares
Subsequent Event [Line Items]            
Estimated gain on sale of properties | $       $ (72,311) $ (277,031) $ 0
Quarterly dividend of common stock declared (in dollar per share)   $ 0.1375   $ 0.28 $ 1.03 $ 1.26
Annualized dividend rate (in dollars per share)   $ 0.55        
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Quarterly dividend of common stock declared (in dollar per share) $ 0.1375          
Annualized dividend rate (in dollars per share) $ 0.55   $ 0.55      
Dividend accrual period on annual basis 360 days          
Annualized dividend rate (in dollars per share) $ 1.675          
Annualized dividend rate, per 30-day month $ 0.1395833          
Subsequent Event [Member] | Property Dispositions, 2016 [Member]            
Subsequent Event [Line Items]            
Number of real estate properties disposed | property     36      
Aggregate gross sales price | $     $ 148,300      
Estimated gain on sale of properties | $     $ 15,200