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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, 2018 | Dec. 31, 2017
Investment available for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at January 1, 2018 | $ 17,752 | $ 17,259
Total gains (losses) (realized or unrealized): |  |
Included in earnings | 144 | 138
Included in other comprehensive income (loss) | (1,649) | 795
Purchases, sales, issuances and settlements: |  |
Settlements | (475) |
Balance at December 31, 2018 | 15,772 | 17,752
Purchases, sales, issuances and settlements: |  |
Settlements |  | 440
Contingent Payments |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at January 1, 2018 | (2,887) | (3,038)
Total gains (losses) (realized or unrealized): |  |
Included in earnings | (249) | (335)
Included in other comprehensive income (loss) | 0 | 0
Purchases, sales, issuances and settlements: |  |
Settlements | (839) | (819)
Balance at December 31, 2018 | $ (2,407) | $ (2,887)
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 | -110 | -333

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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