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Investments - Schedule of Proceeds from Sales or Other Redemptions of Available-For-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Proceeds From Sale And Maturity Of Available For Sale Securities [Abstract]
Proceeds from sales or other redemptions	$ 118,557	$ 67,721	$ 240,263	$ 142,698

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- Definition

Proceeds from sales or other redemptions of available for sale securities.

+ References

No definition available.

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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