Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Summary of Marketable Securities Consist of Investments

Marketable securities consist of the following (in thousands):

	December 31, 2014							December 31, 2013							Fair Value Category
	Cost		Gross Unrealized Gains (Losses)			Recorded Basis		Cost		Gross Unrealized (Losses)			Recorded Basis
Current:
Available-for-sale:
VRDN	$	21,670	$	0		$	21,670	$	10,000	$	0		$	10,000		2
Certificates of deposit		8,330		(43	)		8,287		0		0			0		2
Corporate bonds		0		0			0		9,800		(13	)		9,787		2
	$	30,000	$	(43	)	$	29,957	$	19,800	$	(13	)	$	19,787
Long term:
Available-for-sale:
Municipal bonds	$	3,843	$	7		$	3,850	$	4,074	$	(17	)	$	4,057		2
Corporate bonds		2,153		(3	)		2,150		1,879		(27	)		1,852		2
Certificates of deposit		14,944		(14	)		14,930		0		0			0		2
	$	20,940	$	(10	)	$	20,930	$	5,953	$	(44	)	$	5,909

Summary of Restricted Marketable Securities Component and Workers' Compensation Deposits

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

	December 31, 2014							December 31, 2013						Fair Value Category
	Cost		Gross Unrealized Gains (Losses)			Recorded Basis		Cost		Gross Unrealized Gains		Recorded Basis
Current:
Available-for-sale:
Money market funds held in trust	$	3,776	$	0		$	3,776	$	0	$	0	$	0		2
	$	3,776	$	0		$	3,776	$	0	$	0	$	0
Long term:
Available-for-sale:
Money market funds held in trust	$	46,310	$	0		$	46,310	$	0	$	0	$	0		2
Municipal bonds		4,352		21			4,373		4,742		10		4,752		2
Corporate bonds		3,540		(3	)		3,537		2,849		5		2,854		2
U.S. treasuries		3,963		0			3,963		2,787		0		2,787		1
	$	58,165	$	18		$	58,183	$	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):

	December 31, 2014						December 31, 2013
	Cost		Gross Unrealized Gains		Recorded Basis		Cost		Gross Unrealized Gains		Recorded Basis		Fair Value Category
Restricted certificates of deposit	$	114,335	$	0	$	114,335	$	12,789	$	0	$	12,789		2