Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2013

Investments, Debt and Equity Securities [Abstract]

Summary of available-for-sale securities

The following is a summary of available-for-sale securities at March 31, 2013 and December 31, 2012:

($ in thousands)		2013				2012
Marketable Securities:	Fair Value Hierarchy	Cost		Estimated Fair Value		Cost		Estimated Fair Value
Certificates of deposit
with unrecognized losses for less than 12 months		$	1,435	$	1,431	$	1,578	$	1,571
with unrecognized losses for more than 12 months		58		58		508		507
with unrecognized gains		7,040		7,102		5,586		5,628
Total Certificates of deposit	Level 1	8,533		8,591		7,672		7,706
US Treasury and agency notes
with unrecognized losses for less than 12 months		992		982		3,057		3,024
with unrecognized losses for more than 12 months		3,936		3,909		874		873
with unrecognized gains		12,177		12,271		12,175		12,267
Total US Treasury and agency notes	Level 2	17,105		17,162		16,106		16,164
Corporate notes
with unrecognized losses for less than 12 months		5,207		5,156		1,993		1,971
with unrecognized losses for more than 12 months		—		—		201		200
with unrecognized gains		25,278		25,655		29,210		29,653
Total Corporate notes	Level 2	30,485		30,811		31,404		31,824
Municipal notes
with unrecognized losses for less than 12 months		1,286		1,281		1,961		1,948
with unrecognized losses for more than 12 months		827		822		620		613
with unrecognized gains		7,128		7,238		6,702		6,794
Total Municipal notes	Level 2	9,241		9,341		9,283		9,355
		$	65,364	$	65,905	$	64,465	$	65,049

Summary of maturities, at par, of marketable securities

The following tables summarize the maturities, at par, of marketable securities by year:

(in thousands)
At 3/31/2013	2013		2014		2015		2016		2017		Total
Certificates of deposit	$	1,255	$	1,627	$	4,213	$	1,301	$	—	$	8,396
U.S. Treasury and agency notes	5,316		6,232		3,573		2,000		18		17,139
Corporate notes	6,514		6,729		9,730		4,681		1,625		29,279
Municipal notes	1,705		4,340		2,205		735		—		8,985
	$	14,790	$	18,928	$	19,721	$	8,717	$	1,643	$	63,799

(in thousands)
At 12/31/2012	2013		2014		2015		2016		Total
Certificates of deposit	$	1,268	$	1,627	$	4,316	$	301	$	7,512
U.S. Treasury and agency notes	6,285		7,248		2,633		11		16,177
Corporate notes	10,916		6,729		9,420		3,325		30,390
Municipal notes	2,305		4,340		1,960		400		9,005
	$	20,774	$	19,944	$	18,329	$	4,037	$	63,084