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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, 2017	Dec. 31, 2016
Liabilities
Obligation under assessment arrangements	$ 31,729	$ 33,456
Other financial instruments		100
Carrying Value
Liabilities
Obligation under assessment arrangements	25,602	26,660
Other financial instruments		97
Estimated Fair Value
Liabilities
Obligation under assessment arrangements	$ 26,999	27,054
Other financial instruments		$ 97

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- Definition

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

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- Definition

Other Financial Instruments, Liabilities, Fair Value Disclosure

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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://www.xbrl.org/2003/role/presentationRef
-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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