Earnings Per Share Earnings Per Common Share (Narrative) (Details) - Performance-based restricted stock units [Member]	12 Months Ended
Dec. 31, 2018 shares
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based shares available for vesting	600,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based shares available for vesting	0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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