Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2013

Marketable Securities

Schedule of amortized cost and fair value for held-to-maturity securities by major security type

	September 30, 2013
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
Certificates of deposit	$	245,000	$	118	$	—	$	245,118
Municipal bonds	206,357		1,053		—		207,410
	$	451,357	$	1,171	$	—	$	452,528

	December 31, 2012
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
Certificates of deposit	$	2,802,993	$	8,684	$	—		$	2,811,677
Municipal bonds	2,903,003		5,057		(30		)	2,908,030
	$	5,705,996	$	13,741	$	(30	)	$	5,719,707