Share-Based Compensation and Benefit Plans (Other Share-Based Compensation) (Narrative) (Details)	9 Months Ended
Sep. 30, 2019 Rate
Restricted stock [Member] \| Employee [Member]
Share-Based Compensation and Benefit Plans
Vesting period	3 years
Restricted stock [Member] \| Director [Member]
Share-Based Compensation and Benefit Plans
Vesting period	3 years
Employee stock purchase plan [Member]
Share-Based Compensation and Benefit Plans
Employee stock purchase plan, stock purchase percentage	85.00%

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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