Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2015

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



($ in thousands)		2015				2014
Marketable Securities:	Fair Value Hierarchy	Cost		Estimated Fair Value		Cost		Estimated Fair Value
Certificates of deposit
with unrecognized losses for less than 12 months		$	4,810	$	4,797	$	2,522	$	2,492
with unrecognized losses for more than 12 months		239		238		837		832
with unrecognized gains		2,800		2,805		5,379		5,395
Total Certificates of deposit	Level 1	7,849		7,840		8,738		8,719
US Treasury and agency notes
with unrecognized losses for less than 12 months		860		857		1,919		1,910
with unrecognized losses for more than 12 months		—		—		702		700
with unrecognized gains		736		738		1,182		1,207
Total US Treasury and agency notes	Level 2	1,596		1,595		3,803		3,817
Corporate notes
with unrecognized losses for less than 12 months		14,638		14,516		3,872		3,841
with unrecognized losses for more than 12 months		2,080		2,061		4,423		4,405
with unrecognized gains		3,334		3,339		16,897		16,963
Total Corporate notes	Level 2	20,052		19,916		25,192		25,209
Municipal notes
with unrecognized losses for less than 12 months		1,742		1,725		739		733
with unrecognized losses for more than 12 months		301		298		457		456
with unrecognized gains		1,435		1,441		3,183		3,206
Total Municipal notes	Level 2	3,478		3,464		4,379		4,395
		$	32,975	$	32,815	$	42,112	$	42,140

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