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Fair Value Measurements (Fair Value Balance Sheet Grouping) (Details) - Parent Company [Member] - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Liabilities
Obligation under assessment arrangements	$ 29,943	$ 31,729
Carrying Value
Liabilities
Obligation under assessment arrangements	24,477	25,602
Estimated Fair Value
Liabilities
Obligation under assessment arrangements	$ 29,591	$ 26,999

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- Definition

Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]

+ References

No definition available.

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- Definition

Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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