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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets. fair value	$ 903,709	$ 633,110
Book value	28,043	19,009
Held-to-maturity Securities | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets. fair value	474,205	206,161
Unrealized gain (loss)	(217)	$ (96)
Held-to-maturity Securities | Long-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets. fair value	14,738
Unrealized gain (loss)	118
Book value	$ 14,620

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Publisher FASB
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-Name Accounting Standards Codification
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