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Fair Value Measurements (Changes in Fair Value of Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Investment available for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at January 1, 2015 | $ 17,259 | $ 17,839
Total gains (losses) (realized or unrealized): |  |
Included in earnings | 138 | 130
Included in other comprehensive income (loss) | 795 | (299)
Purchases, sales, issuances and settlements: |  |
Settlements | (440) |
Balance at December 31, 2017 | 17,752 | 17,259
Purchases, sales, issuances and settlements: |  |
Settlements |  | 411
Contingent Payments |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at January 1, 2017 | (3,038) | (3,632)
Total gains (losses) (realized or unrealized): |  |
Included in earnings | (335) | (600)
Included in other comprehensive income (loss) | 0 | 0
Purchases, sales, issuances and settlements: |  |
Settlements | (819) | (848)
Balance at December 31, 2017 | $ (2,887) | $ (3,038)
Non-operating income | Investment available for sale |  |
Total gains (losses) (realized or unrealized): |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings, Description | 0 | 0
Non-operating income | Contingent Payments |  |
Total gains (losses) (realized or unrealized): |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings, Description | -333 | 346

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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