Earnings Per Share (Narrative) (Details) - shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share Narrative [Line Items]
Weighted average unvested shares outstanding	200,000	200,000	200,000
Anti-dilutive stock options excluded from dilutive earnings per share calculation	682	682	682
Cumulative convertible preferred share, dividend rate	5.00%	5.00%	5.00%
5.417% Series 1 Cumulative Convertible Preferred Shares
Earnings Per Share Narrative [Line Items]
Cumulative convertible preferred share, dividend rate	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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Name:	us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration