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Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2012

Marketable Securities [Abstract]

Summary of available-for-sale securities

The following is a summary of available-for-sale securities at June 30, 2012 and December 31, 2011:

($ in thousands)						2012								2011
Marketable Securities:		Fair Value Hierarchy				Cost				Estimated Fair Value				Cost				Estimated Fair Value
Certificates of deposit
with unrecognized losses for less than 12 months						$	1,902			$	1,893			$	3,646			$	3,605
with unrecognized losses for more than 12 months							103				103				—				—
with unrecognized gains							4,324				4,360				3,525				3,551
Total Certificates of deposit			Level 1				6,329				6,356				7,171				7,156
US Treasury and agency notes
with unrecognized losses for less than 12 months							6,293				6,236				4,352				4,338
with unrecognized losses for more than 12 months							—				—				1,002				1,000
with unrecognized gains							14,723				14,844				16,479				16,660
Total US Treasury and agency notes			Level 2				21,016				21,080				21,833				21,998
Corporate notes
with unrecognized losses for less than 12 months							4,739				4,707				9,230				9,098
with unrecognized losses for more than 12 months							821				818				1,539				1,494
with unrecognized gains							26,052				26,460				19,369				19,738
Total Corporate notes			Level 2				31,612				31,985				30,138				30,330
Municipal notes
with unrecognized losses for less than 12 months							1,058				1,048				1,177				1,165
with unrecognized losses for more than 12 months							952				944				881				873
with unrecognized gains							7,516				7,622				6,964				7,044
Total Municipal notes			Level 2				9,526				9,614				9,022				9,082
						$	68,483			$	69,035			$	68,164			$	68,566

Summary of maturities, at par, of marketable securities

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

(in thousands)
At June 30, 2012		2012				2013				2014				2015				2016				Total
Certificates of deposit		$	200			$	1,255			$	1,627			$	2,739			$	301			$	6,122
U.S. Treasury and agency notes			671				8,785				8,982				2,633				—				21,071
Corporate notes			2,377				11,416				7,097				8,334				1,313				30,537
Municipal notes			710				2,305				4,345				1,760				100				9,220
		$	3,958			$	23,761			$	22,051			$	15,466			$	1,714			$	66,950

(in thousands)
At December 31, 2011		2012				2013				2014				2015				2016				Total
Certificates of deposit		$	1,536			$	1,255			$	1,627			$	2,526			$	—			$	6,944
U.S. Treasury and agency notes			4,734				10,285				5,856				936				—				21,811
Corporate notes			3,450				11,231				8,923				5,584				—				29,188
Municipal notes			860				2,505				4,145				1,160				—				8,670
		$	10,580			$	25,276			$	20,551			$	10,206			$	—			$	66,613

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