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Contingencies (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingency [Abstract]
Due to Related Parties, Noncurrent	$ 61,801	$ 0
Product Warranty Expense	1,256	(149)	$ 1,285
Balance as of December 31, 2017	349	969	388
Payments and settlements	(88)	(471)	(704)
Balance as of June 30, 2018	1,517	$ 349	$ 969
Minimum
Loss Contingencies
Potential loss liability	65,000
Maximum
Loss Contingencies
Potential loss liability	$ 90,000

X

- Definition

Portion of the carrying amount as of the balance sheet date of obligations due all related parties that is payable after one year or beyond the normal operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

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