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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings				$ (9)
Assets Beginning Balance				158
Purchases and Issuances				0
Sales and Settlements				0
Transfers In (Out)				0
Assets Ending Balance		$ 167		167
Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ 0	1	$ 5
Assets Beginning Balance	164	168	169
Purchases and Issuances			0
Sales and Settlements			0
Transfers In (Out)	60		60
Assets Ending Balance	104	167	104	167
Auction rate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	2,163	161	2,218	983
Assets Beginning Balance	72,621	107,170	87,398	(84,926)
Purchases and Issuances	(2,150)	(25)	(6,250)	22,075
Sales and Settlements	(34,925)	(250)	(36,145)	(1,200)
Transfers In (Out)	16,253		33,855	0
Assets Ending Balance	21,430	106,784	21,430	106,784
Auction Rate Securities Purchase Commitment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings				849
Assets Beginning Balance				849
Purchases and Issuances			0	0
Sales and Settlements			0	0
Transfers In (Out)			(1,169)	0
Assets Ending Balance		0		0
Liabilities Beginning Balance	131	254	8	645
Total Realized and Unrealized Gains (Loss), Liabilities	(948)	(22)	(1,162)	369
Liabilities Ending Balance	1	276	1	276
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net	1,078
Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		1	(14)	9
Assets Beginning Balance		36	35	44
Purchases and Issuances			(76)	0
Sales and Settlements			(125)	0
Transfers In (Out)			0	0
Assets Ending Balance	$ 0	$ 35	$ 0	$ 35

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset purchases sales issuances settlements.

+ References

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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.

+ References

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-Publisher FASB
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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Fair value of 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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Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

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