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Commitments and Contingencies (Narrative I) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2019
Loss Contingencies [Line Items]
Reserves for proceeding-related contingencies		$ 5,320
Aggregate amount for legal actions for which no loss amount has been accrued		11,249
Loss accrued for reasonably possible legal actions	$ 0
Buyer Protection Program [Member]
Loss Contingencies [Line Items]
Provision for maximum potential exposure	988,664	1,051,292
Product liability, contingency, recorded allowance	$ 4,146	$ 4,313

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- Definition

Aggregate amount for legal actions for which no loss amount has been accrued.

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Product Liability, Contingency, Recorded Allowance

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Amount of loss contingency liability.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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Present value of the accrual for product liability loss contingencies as of the balance sheet date (if the accrual qualifies for discounting).

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-SubTopic 20
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