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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] + References No definition available. + Details
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- Definition Other Financial Instruments, Liabilities, Fair Value Disclosure + References No definition available. + Details
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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 + Details
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