Earnings Per Share (Narrative) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Weighted average unvested shares outstanding	300,000	200,000	300,000	200,000
Anti-dilutive stock options	682	0	682	0
Cumulative convertible preferred shares, dividend rate	5.417%	5.417%	5.417%	5.417%