Fair Values of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2012

Fair Values of Financial Instruments [Abstract]

Fair value measurements by level for assets and liabilities measured at fair value on a recurring basis

	Level 1				Level 2				Level 3				Total
Description	2012		2011		2012		2011		2012		2011		2012		2011
Cash and cash equivalents	$	36,715	$	18,568	$	—	$	—	$	—	$	—	$	36,715	$	18,568
Investments		2,800		—		—		25,311		923		902		3,723		26,213
Total assets at fair value	$	39,515	$	18,568	$	—	$	25,311	$	923	$	902	$	40,438	$	44,781

Changes in Level 3 instruments

	For the Three Months Ended June 30,					For the Six Months Ended June 30,
	2012		2011			2012			2011
Balance at beginning of period	$	882	$	962		$	902		$	951
Losses included in earnings		—		—			(11	)		—
Gains (losses) included in other comprehensive income		41		(8	)		32			3
Balance as of June 30	$	923	$	954		$	923		$	954