v2.4.0.8

Fair Value Measurements (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2013

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Summary of Placement in the Fair Value Hierarchy of Financial Assets that are Measured at Fair Value on a Recurring Basis

The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at September 30, 2013:

		Quoted prices in active markets (level 1)				Significant other observable inputs (level 2)				Significant unobservable inputs (level 3)				September 30, 2013
Assets
U.S. government debt securities (Note 4)		$	—			$	205,768			$	—			$	205,768
Commercial paper (Note 4)			—				10,247				—				10,247
Certificates of deposit (Note 4)			—				1,766				—				1,766
Equity securities (Note 3)			75,754				31,813				—				107,567
		$	75,754			$	249,594			$	—			$	325,348

The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at December 31, 2012:

		Quoted prices in active markets (level 1)				Significant other observable inputs (level 2)				Significant unobservable inputs (level 3)				December 31, 2012
Assets
Certificates of deposit (Note 4)		$	—			$	260			$	—			$	260
Equity securities (Note 3)			72,988				10,128				—				83,116
		$	72,988			$	10,388			$	—			$	83,376

The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at December 31, 2012:

		Quoted prices in active markets (level 1)				Significant other observable inputs (level 2)				Significant unobservable inputs (level 3)				December 31, 2012
Assets
Equity securities (Note 4)		$	72,988			$	10,128			$	—			$	83,116
		$	72,988			$	10,128			$	—			$	83,116

The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at December 31, 2011:

		Quoted prices in active markets (level 1)				Significant other observable inputs (level 2)				Significant unobservable inputs (level 3)				December 31, 2011
Assets
Equity securities (Note 4)		$	39,097			$	—			$	—			$	39,097
		$	39,097			$	—			$	—			$	39,097

X

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a),(b)

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

+ Details

Name:	us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration