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Investment in Marketable Securities - RealD (Details) (USD $) In Thousands, except Share data	1 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Investment in Company Three (Textual) [Abstract]
Number of options to purchase common stock			1,085,828
Exercise price of options	$ 0.00667
Investment in RealD through options			$ 18,909
Additional options earned to purchase common stock of RealD		136,952
Approximate increase in investment in RealD and its deferred lease incentive liability		3,402
Number of shares owned in RealD		1,222,780
Estimated fair value of company owned shares in RealD		11,433
Unrealized holding gain		$ 19,970

X

- Definition

Number of additional options to purchase common shares of RealD earned during period.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price of options to purchase common shares of RealD.

+ Details

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X

- Definition

Increase in Investment in Company Three.

+ Details

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X

- Definition

Investment In Real D.

+ Details

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X

- Definition

Number of shares owned in RealD.

+ Details

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Period Type:	instant

X

- Definition

Number of options to purchase common shares of RealD in which the company has vested.

+ Details

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X

- Definition

This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ Details

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Namespace Prefix:	us-gaap
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Period Type:	instant

X

- Definition

This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 17

-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.



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 210.5-02.12)

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



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

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