Marketable Securities

6 Months Ended

Jun. 30, 2013

Marketable Securities

2.   MARKETABLE SECURITIES

(in thousands)	June 30, 2013
	Amortized         Cost		Unrealized         Gains		Unrealized         Losses		Fair Value
Municipal bonds	$	38,222		34		(43)	$	38,213
Corporate bonds		30,282		42		(71)		30,253
Certificates of deposit		1,504		—		(4)		1,500
	$	70,008		76		(118)	$	69,966

(in thousands)	December 31, 2012
	Amortized         Cost		Unrealized         Gains		Unrealized         Losses		Fair Value
Municipal bonds	$	30,488		48		(10)	$	30,526
Corporate bonds		14,853		83		(2)		14,934
	$	45,341		131		(12)	$	45,460

The Company considers debt securities with maturities of three months or less from the purchase date to be cash equivalents. Interest is recorded when earned. All of the Company’s investments are classified as available-for-sale and are carried at fair value with unrealized gains and losses recorded as a component of accumulated other comprehensive income, net of related income taxes.

As of June 30, 2013, remaining maturities of marketable debt securities ranged from July 2013 to August 2015, with a weighted-average remaining maturity of approximately 13 months.