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Shareholders' Equity (Narrative) (Details) - USD ($)
12 Months Ended
Jan. 18, 2018
Jan. 12, 2018
Dec. 15, 2017
Sep. 15, 2017
Aug. 24, 2017
Aug. 16, 2017
Aug. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Class Of Stock [Line Items]                  
Preferred stock, shares authorized               12,500,000  
Net proceeds from sale of preferred stock               $ 120,432,000  
Common stock, shares issued               91,317,000 85,316,000
Stock price as percentage of market value               100.00%  
Remaining shares authorized under DRIP               2,838,000  
Accrued preferred stock dividends               $ 1,600,000 $ 1,600,000
Forward Sales Agreement [Member]                  
Class Of Stock [Line Items]                  
Common stock, shares issued             5,750,000    
Settlement date of agreements             Aug. 01, 2017    
Public offering, estimated net proceeds             $ 43,200,000    
Subsequent Event [Member]                  
Class Of Stock [Line Items]                  
Dividends payable, date declared Jan. 18, 2018                
Common stock, dividends declared $ 0.05                
Dividends payable, date to be paid Feb. 20, 2018                
Dividends payable, date of record Feb. 12, 2018                
Series B [Member]                  
Class Of Stock [Line Items]                  
Dividend rate percentage               7.25%  
Redemption date               May 22, 2017  
Redemption price per share       $ 25.00   $ 25.00   $ 25.00  
Preferred stock, shares authorized               3,450,000 10,000,000
Preferred stock redeemed, shares       3,000,000   1,500,000      
Redemption price plus accrued and unpaid dividends amount       $ 75,000,000   $ 37,500,000      
Series B [Member] | Subsequent Event [Member]                  
Class Of Stock [Line Items]                  
Redemption price per share   $ 25.00              
Preferred stock redeemed, shares   2,000,000              
Redemption price plus accrued and unpaid dividends amount   $ 50,000,000              
Preferred stock dividends declared $ 0.453125                
Series C [Member]                  
Class Of Stock [Line Items]                  
Dividend rate percentage               6.50%  
Redemption date               Aug. 24, 2022  
Redemption price per share               $ 25.00  
Preferred stock, shares authorized               6,450,000  
Common stock sales, net of issuance expenses, shares     2,000,000   3,000,000        
Shares Issued, price per share     $ 25.00   $ 25.00        
Net proceeds from sale of preferred stock     $ 48,100,000   $ 72,300,000        
Series C [Member] | Subsequent Event [Member]                  
Class Of Stock [Line Items]                  
Preferred stock dividends declared $ 0.406250