Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Assets measured at fair value on recurring basis

			Fair Value Measurements at June 30, 2013
Investment Type	Balance at June 30, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Money market funds	$	70,345	$	70,345	$	-	$	-
Auction rate securities		2,208		-		-		2,208
Total	$	72,553	$	70,345	$	-	$	2,208

			Fair Value Measurements at December 31, 2012
Investment Type	Balance at December 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Money market funds	$	56,224	$	56,224	$	-	$	-
Auction rate securities		3,240		-		-		3,240
Total	$	59,464	$	56,224	$	-	$	3,240

Summary of activities in financial instruments with Level 3 inputs

For those financial instruments with significant Level 3 inputs (all of which are auction rate securities), the following table summarizes the activities for the periods indicated:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3) For the Three Months Ended June 30,
Description	2013			2012

Balance at beginning of period	$	3,148		$	3,240
Transfers into Level 3		-			-
Transfers out of Level 3		-			-
Total gains (losses)
Included in net loss		-			-
Included in other comprehensive loss		60			-
Settlements at par		(1,000	)		-
Balance at end of period	$	2,208		$	3,240
Changes in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period	$	-		$	-

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3) For the Six Months Ended June 30,
Description	2013			2012

Balance at beginning of period	$	3,240		$	3,332
Transfers into Level 3		-			-
Transfers out of Level 3		-			-
Total gains (losses)
Included in net loss		-			-
Included in other comprehensive loss		68			8
Settlements at par		(1,100	)		(100	)
Balance at end of period	$	2,208		$	3,240
Changes in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period	$	-		$	-

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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