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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, 2016	Dec. 31, 2015
Liabilities
Obligation under assessment arrangements	$ 33,456	$ 35,126
Other financial instruments	100	200
Carrying Value
Liabilities
Obligation under assessment arrangements	26,660	27,660
Other financial instruments	97	186
Estimated Fair Value
Liabilities
Obligation under assessment arrangements	27,054	28,381
Other financial instruments	$ 97	$ 186

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

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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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