Earnings Per Share (Narrative) (Details) - shares	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Weighted average unvested shares outstanding	200,000	200,000	200,000	200,000
Anti-dilutive stock options	682	682	682	682
Cumulative convertible preferred shares, dividend rate	5.417%	5.417%	5.417%	5.417%

This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration