Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis

Financial assets and liabilities measured at fair value on a recurring basis at June 30, 2012 and December 31, 2011, consisted of the following:



(in thousands)	Fair Value Measurements
At June 30, 2012	Total		Level 1		Level 2		Level 3
Mutual funds	$	1,511	$	1,511	$	—	$	—
Investments
Federal agency notes	$	24,369	$	24,369	$	—	$	—
Commercial paper	$	33,584	$	33,584	$	—	$	—



(in thousands)	Fair Value Measurements
At December 31, 2011	Total		Level 1		Level 2		Level 3
Mutual funds	$	1,279	$	1,279	$	—	$	—
Investments
Federal agency notes	$	18,621	$	18,621	$	—	$	—
Commercial paper	$	30,912	$	30,912	$	—	$	—

Financial Assets And Liabilities Measured At Fair Value On A Nonrecurring Basis

Financial assets and liabilities measured at fair value on a nonrecurring basis at June 30, 2012, and December 31, 2011, consisted of the following:



(in thousands)	Fair Value Measurements
At June 30, 2012	Total		Level 1		Level 2		Level 3
Convertible debentures	$	164,523	$	—	$	164,523	$	—
Exempt facility revenue bonds	$	27,900	$	—	$	—	$	27,900



(in thousands)	Fair Value Measurements
At December 31, 2011	Total		Level 1		Level 2		Level 3
Convertible debentures	$	160,256	$	—	$	160,256	$	—
Exempt facility revenue bonds	$	27,269	$	—	$	—	$	27,269

- Definition

Tabular disclosure of assets and liabilities by class, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). The disclosures that may be required or desired include: (a) the fair value measurements recorded during the period and the reasons for the measurements and (b) 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 or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

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