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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, 2015	Dec. 31, 2014
Liabilities
Obligation under assessment arrangements	$ 35,126	$ 36,749
Other financial instruments	200	300
Carrying Value
Liabilities
Obligation under assessment arrangements	27,660	28,612
Other financial instruments	186	268
Estimated Fair Value
Liabilities
Obligation under assessment arrangements	28,381	29,529
Other financial instruments	$ 186	$ 268

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- Definition

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 7

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 17
-Article 9

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