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Earnings Per Share (Narrative) (Details) - $ / shares
shares in Thousands, $ / shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Anitidlutive securities exluded from computation of earnings per share [Line Items]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit     $ 0 $ 0
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit     $ 0 $ 0
Series C Cumulative Convertible Preferred Share [Member]        
Anitidlutive securities exluded from computation of earnings per share [Line Items]        
Common shares upon conversion of convertible preferred shares 2,100 2,100 2,100  
Preferred share dividend percentage 5.75% 5.75% 5.75% 5.75%
Series E Cumulative Convertible Preferred Share [Member]        
Anitidlutive securities exluded from computation of earnings per share [Line Items]        
Common shares upon conversion of convertible preferred shares 1,600 1,600 1,600 1,600
Preferred share dividend percentage 9.00% 9.00% 9.00% 9.00%
Share Options [Member]        
Anitidlutive securities exluded from computation of earnings per share [Line Items]        
Common shares upon conversion of convertible preferred shares 86 5 86 5