Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2016

The following is a summary of available-for-sale securities at December 31:



($ in thousands)		2016				2015
Marketable Securities:	Fair Value Hierarchy	Cost		Estimated Fair Value		Cost		Estimated Fair Value
Certificates of deposit
with unrecognized losses for less than 12 months		$	1,868	$	1,863	$	4,810	$	4,797
with unrecognized losses for more than 12 months		—		—		239		238
with unrecognized gains		3,320		3,329		2,800		2,805
Total Certificates of deposit	Level 1	5,188		5,192		7,849		7,840
U.S. Treasury and agency notes
with unrecognized losses for less than 12 months		947		946		860		857
with unrecognized losses for more than 12 months		—		—		—		—
with unrecognized gains		857		859		736		738
Total U.S. Treasury and agency notes	Level 2	1,804		1,805		1,596		1,595
Corporate notes
with unrecognized losses for less than 12 months		11,658		11,592		14,638		14,516
with unrecognized losses for more than 12 months		1,053		1,042		2,080		2,061
with unrecognized gains		3,431		3,435		3,334		3,339
Total Corporate notes	Level 2	16,142		16,069		20,052		19,916
Municipal notes
with unrecognized losses for less than 12 months		2,556		2,526		1,742		1,725
with unrecognized losses for more than 12 months		271		269		301		298
with unrecognized gains		812		814		1,435		1,441
Total Municipal notes	Level 2	3,639		3,609		3,478		3,464

		$	26,773	$	26,675	$	32,975	$	32,815

The following tables summarize the maturities, at par, of marketable securities by year ($ in thousands):