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Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Measurement [Abstract]

Summary of marketable securities consist of investments


		September 30, 2012												December 31, 2011
		Cost				Gross Unrealized (Losses) Gains				Recorded Basis				Cost				Gross Unrealized Gains (Losses)				Recorded Basis				Fair Value Category
Current:
Available-for-sale:
Municipal bonds		$	1,123			($	5	)		$	1,118			$	5,804			$	8			$	5,812				2
Corporate bonds			14,457				0				14,457				11,070				(4	)			11,066				2


		$	15,580			($	5	)		$	15,575			$	16,874			$	4			$	16,878

Long term:
Available-for-sale:
Municipal bonds		$	296			$	1			$	297			$	0			$	0			$	0				2
Corporate bonds			10,636				33				10,669				14,971				(33	)			14,938				2
U.S. treasuries			1,557				3				1,560				0				0				0				1
Held-to-maturity:
Corporate bonds			465				0				465				457				0				457				2


		$	12,954			$	37			$	12,991			$	15,428			$	(33	)		$	15,395

Summary of company's restricted marketable securities and workers' compensation deposits


		September 30, 2012												December 31, 2011
		Cost				Gross Unrealized Losses				Recorded Basis				Cost				Gross Unrealized Gains (Losses)				Recorded Basis				Fair Value Category
Available-for-sale:
Municipal bonds		$	4,624			($	8	)		$	4,616			$	5,580			$	17			$	5,597				2
Corporate bonds			897				(6	)			891				148				(1	)			147				2
U.S. treasuries			1,567				0				1,567				1,567				0				1,567				1

		$	7,088			($	14	)		$	7,074			$	7,295			$	16			$	7,311