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Shareholders' Equity (Narrative) (Details) - USD ($)
 6 Months Ended
Aug. 01, 2016
Jul. 25, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Class Of Stock [Line Items]          
Common stock, shares issued     85,342,000   85,049,000
Public offering, estimated net proceeds     $ 11,000 $ 41,698,000  
Dividends payable, date declared     Jul. 25, 2016    
Dividends payable, date to be paid     Aug. 22, 2016    
Dividends payable, date of record     Aug. 12, 2016    
Subsequent Event [Member]          
Class Of Stock [Line Items]          
Common stock, shares issued 5,750,000        
Public offering, estimated net proceeds $ 44,200,000        
Common stock, dividends declared   $ 0.05      
Subsequent Event [Member] | Series B [Member]          
Class Of Stock [Line Items]          
Preferred stock dividends declared   $ 0.453125