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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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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) [Abstract]

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) [Abstract]

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

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