Fair Value Measurements (Details 5) (ARS, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012 item	Dec. 31, 2013
ARS
Changes in Level 3 assets measured at fair value on recurring basis
Beginning balance	$ 62,311	$ 46,283
Settlements	(16,553)
Realized loss included in other income (expense), net	(2,699)
Reversal of pre-tax impairment charges included in accumulated other comprehensive income (loss)	3,224
Ending balance	$ 46,283	$ 46,283
Number of auction rate securities sold or redeemed for full par value	1
Number of auction rate securities (ARS) sold in a secondary market	2
Number of auction rate securities (ARS) settled	3

The number of auction rate securities (ARS) settled during the period.

No definition available.

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- Definition

The number of auction rate securities (ARS) sold in a secondary market during the period.

+ References

No definition available.

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- Definition

The number of auction rate securities (ARS) sold or redeemed for its full par value during the period.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized loss realized upon the write-down of available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580

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-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580

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