Variable Interest Entities (Narrative) (Details)	12 Months Ended
Dec. 31, 2018 USD ($) entity	Dec. 31, 2017 USD ($)
Variable Interest Entities [Abstract]
VIE liabilities, contingent liabilities, and guarantees \| $	$ 0	$ 0
Number of VIE's that hold junior subordinated notes. \| entity	2

Number of Variable Interest Entities (VIE) or potential VIEs for which the necessary information is unable to be obtained to: (1) determine whether the legal entity is a VIE, (2) determine whether it (the reporting entity) is the VIE's primary beneficiary, or (3) perform the accounting required to consolidate the VIE for which it is determined that it (the reporting entity) is the primary beneficiary.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5747-111685

Name:	us-gaap_VariableInterestEntityNumberOfEntitiesWithUnavailabilityOfInformation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration