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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2009	Apr. 05, 2009 Siemens Customer Relationships [Member] Fair Value, Measurements, Nonrecurring [Member]	Dec. 31, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Significant Other Observable Inputs (Level 2) [Member] Fair Value, Measurements, Recurring [Member]	Apr. 05, 2009 Significant Unobservable Inputs (Level 3) [Member] Siemens Customer Relationships [Member] Fair Value, Measurements, Nonrecurring [Member]
Assets:
Money market instruments			$ 1,699	$ 0
Municipal bonds			0	123,716
Corporate bonds			0	115,472
Agency bonds			0	39,880
Sovereign bonds			0	26,371
Covered bonds			0	6,020
Treasury bills			0	1,945
Currency forward contracts			14	0
Liabilities:
Currency forward contracts			165	0
Company's fair value hierarchy for the Siemens Customer Relationships
Fair value		300			300
Intangible asset impairment charge (Note 7)	$ (1,000)

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This element represents the sum of all intangible assets having statutory or estimated useful lives.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 33

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 46

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Name Accounting Standards Codification

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