Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Summary of available-for-sale securities

The following is a summary of available-for-sale securities at:

		September 30, 2013				December 31, 2012
($ in thousands)	Fair Value Hierarchy	Cost		Estimated Fair Value		Cost		Estimated Fair Value
Certificates of deposit
with unrecognized losses for less than 12 months		$	1,717	$	1,707	$	1,578	$	1,571
with unrecognized losses for more than 12 months		111		111		508		507
with unrecognized gains		7,006		7,050		5,586		5,628
Total Certificates of deposit	Level 1	8,834		8,868		7,672		7,706
US Treasury and agency notes
with unrecognized losses for less than 12 months		5,853		5,841		3,057		3,024
with unrecognized losses for more than 12 months		3,948		3,930		874		873
with unrecognized gains		5,957		6,001		12,175		12,267
Total US Treasury and agency notes	Level 2	15,758		15,772		16,106		16,164
Corporate notes
with unrecognized losses for less than 12 months		9,155		9,049		1,993		1,971
with unrecognized losses for more than 12 months		316		315		201		200
with unrecognized gains		22,082		22,338		29,210		29,653
Total Corporate notes	Level 2	31,553		31,702		31,404		31,824
Municipal notes
with unrecognized losses for less than 12 months		1,378		1,360		1,961		1,948
with unrecognized losses for more than 12 months		1,045		1,040		620		613
with unrecognized gains		5,689		5,745		6,702		6,794
Total Municipal notes	Level 2	8,112		8,145		9,283		9,355
		$	64,257	$	64,487	$	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 September 30, 2013	2013		2014		2015		2016		2017		Total
Certificates of deposit	$	965	$	1,627	$	4,213	$	1,501	$	437	$	8,743
U.S. Treasury and agency notes	890		6,787		5,168		2,350		592		15,787
Corporate notes	1,752		6,729		10,137		6,604		5,074		30,296
Municipal notes	450		3,675		2,205		1,235		295		7,860
	$	4,057	$	18,818	$	21,723	$	11,690	$	6,398	$	62,686

(in thousands)
At December 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