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Legal Proceedings and Contingencies - Regulatory Actions (Details) - USD ($)	Jan. 13, 2016	Jun. 30, 2018	Dec. 31, 2015
Indemnification clauses
Contingencies
Liabilities accrued		$ 0
Office of Foreign Assets Control [Member]
Contingencies
Liabilities accrued			$ 900,000
Transaction period under review	5 years
Range of potential penalties assessed			$ 0

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Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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-Name Accounting Standards Codification
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-Section 50
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Transaction period under review for potential regulatory infractions.

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