Fair Value Measurement (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

Summary of Marketable Securities Consist of Investments

Marketable securities consist of the following investments (in thousands):

	June 30, 2014							December 31, 2013
	Cost		Gross Unrealized Losses			Recorded Basis		Cost		Gross Unrealized Losses			Recorded Basis		Fair Value Category
Current:
Available-for-sale:
VRDN		22,000		0			22,000		10,000		0			10,000		2
Corporate bonds		10,045		(12	)		10,033		9,800		(13	)		9,787		2
	$	32,045	$	(12	)	$	32,033	$	19,800	$	(13	)	$	19,787
Long term:
Available-for-sale:
Municipal bonds	$	4,404	$	(29	)	$	4,375	$	4,074	$	(17	)	$	4,057		2
Corporate bonds		6,285		(63	)		6,222		1,879		(27	)		1,852		2
	$	10,689	$	(92	)	$	10,597	$	5,953	$	(44	)	$	5,909

Summary of Long Term Restricted Marketable Securities Component and Workers' Compensation Deposits

The Company’s long-term restricted marketable securities component of restricted marketable securities and workers’ compensation deposits consists of the following (in thousands):

	June 30, 2014						December 31, 2013
	Cost		Gross Unrealized Gains		Recorded Basis		Cost		Gross Unrealized Gains		Recorded Basis		Fair Value Category
Available-for-sale:
Money market funds held in trust	$	21,886	$	0	$	21,886	$	0	$	0	$	0		1
Municipal bonds		4,928		16		4,944		4,742		10		4,752		2
Corporate bonds		2,922		8		2,930		2,849		5		2,854		2
U.S. treasuries		4,267		0		4,267		2,787		0		2,787		1
	$	34,003	$	24	$	34,027	$	10,378	$	15	$	10,393

Schedule of Long-term Restricted Certificates of Deposit

The Company’s long-term restricted certificates of deposit are summarized as follows (in thousands):

	June 30, 2014						December 31, 2013
	Cost		Gross Unrealized Gains		Recorded Basis		Cost		Gross Unrealized Gains		Recorded Basis		Fair Value Category
Restricted certificates of deposit	$	20,943	$	0	$	20,943	$	12,789	$	0	$	12,789		2