Income Per Common Share (Computation Of Basic And Diluted Income (Loss) Per Common Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended													12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Income (Loss) Per Common Share [Line Items]
Net income	$ 9,026	[1]	$ 3,169	$ 1,785	$ 2,192	$ 2,083	$ 1,538	$ 3,334	$ 991	$ 1,866	$ 2,019	$ 1,820	$ 1,666	$ 16,172		$ 7,946		$ 7,371
Net income allocated to common shareholders, basic														15,805		7,766		7,222
Basic weighted-average common shares outstanding														26,885,000		26,967,000		27,441,000
Basic income per common share														$ 0.59		$ 0.29		$ 0.26
Net income allocated to common shareholders, diluted														15,813		7,768		7,224
Effect of dilutive stock options and awards														813,000	[2]	444,000	[2]	318,000	[2]
Diluted weighted-average common shares outstanding														27,698,000		27,411,000		27,759,000
Diluted income per common share	$ 0.31	[1]	$ 0.11	$ 0.06	$ 0.08	$ 0.07	$ 0.06	$ 0.12	$ 0.04	$ 0.07	$ 0.07	$ 0.06	$ 0.06	$ 0.57		$ 0.28		$ 0.26
Antidilutive securities excluded from computation of earnings per share														656,000		1,700,000		2,000,000
Basic [Member]
Income (Loss) Per Common Share [Line Items]
Net income allocated to participating securities														(367)		(180)		(149)
Diluted [Member]
Income (Loss) Per Common Share [Line Items]
Net income allocated to participating securities														$ (359)		$ (178)		$ (147)

[1] The fourth quarter 2013 net income and income per common share-diluted includes the favorable effect of a $12.7 million pre-tax gain on the sale of an investment in the common stock of Medafor, Inc. as a result of C.R. Bard, Inc. completing its acquisition of the outstanding common shares of Medafor, Inc. and the unfavorable effect of a $3.2 million other than temporary investment impairment as a result of the impairment and write-down of the Company’s investment in ValveXchange preferred stock.

[2] The Company excluded stock options from the calculation of diluted weighted-average common shares outstanding if the per share value, including the sum of (i) the exercise price of the options and (ii) the amount of the compensation cost attributed to future services and not yet recognized, was greater than the average market price of the shares, because the inclusion of these stock options would be antidilutive to income per common share. Accordingly, stock options to purchase 656,000, 1.7 million, and 2.0 million, shares for the years ended December 31, 2013, 2012, and 2011, respectively, were excluded from the calculation of diluted weighted-average common shares outstanding.