Share-Based Compensation Stock Option Activity (Details) - shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2017
Share-based Payment Arrangement, Option [Member]
A summary of option activity for the period [Roll Forward]
Number of options, exercised	0	0

Number of share options (or share units) exercised during the current period.

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