Investments - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Impairment losses recorded on debt securities	$ 0	$ 0	$ 0	$ 0
Impairment losses recorded on equity securities	$ 0	$ 0	$ 0	$ 0

Equity Securities Without Readily Determinable Fair Value, Impairment Loss, Annual Amount

No definition available.

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Balance Type:	debit
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