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Note 10 - Product Warranty Obligations (Details) - Deferred Product Obligations (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Product warranty liability
Current portion - other accrued liabilities	$ 24,143us-gaap_StandardProductWarrantyAccrualCurrent	$ 26,080us-gaap_StandardProductWarrantyAccrualCurrent
Long-term portion - other long-term liabilities	6,766us-gaap_StandardProductWarrantyAccrualNoncurrent	7,654us-gaap_StandardProductWarrantyAccrualNoncurrent
Total	30,909us-gaap_StandardProductWarrantyAccrual	33,734us-gaap_StandardProductWarrantyAccrual	36,111us-gaap_StandardProductWarrantyAccrual	24,643us-gaap_StandardProductWarrantyAccrual
Deferred revenue related to extended warranty
Current portion - other accrued liabilities	4,519us-gaap_ExtendedProductWarrantyAccrualCurrent	3,325us-gaap_ExtendedProductWarrantyAccrualCurrent
Long-term portion - other long-term liabilities	22,674us-gaap_ExtendedProductWarrantyAccrualNoncurrent	19,767us-gaap_ExtendedProductWarrantyAccrualNoncurrent
Total	$ 27,193us-gaap_ExtendedProductWarrantyAccrual	$ 23,092us-gaap_ExtendedProductWarrantyAccrual	$ 13,474us-gaap_ExtendedProductWarrantyAccrual	$ 9,737us-gaap_ExtendedProductWarrantyAccrual

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- Definition

Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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- Definition

Amount at end of the reporting period of the aggregate extended product warranty liability that is expected to be paid within one year of the balance sheet date or normal operating cycle, if longer. Does not include the balance for the standard product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount at end of the reporting period of the aggregate extended product warranty liability that is expected to be paid after one year from the balance sheet date or normal operating cycle, if longer. Does not include the balance for the standard product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 24

-Article 5

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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Amount as of the balance sheet date of the aggregate standard product warranty liability that is expected to be paid within one year or the normal operating cycle, if longer. Does not include the balance for the extended product warranty liability.

+ References

No definition available.

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Amount as of the balance sheet date of the aggregate standard product warranty liability that is expected to be paid after one year or beyond the normal operating cycle, if longer. Does not include the balance for the extended product warranty liability.

+ References

No definition available.

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