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Commitments and Contingencies (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) yr
Inventories [Member] |
Loss Contingencies [Line Items] |
Outstanding inventory purchase obligations | $ | $ 266,507,000
Minimum [Member] |
Loss Contingencies [Line Items] |
Operating leases, base lease term | 5
Maximum [Member] |
Loss Contingencies [Line Items] |
Operating leases, base lease term | 10

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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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