Condensed Consolidated Statement Of Stockholders' Equity (USD $) In Thousands	Common Stock [Member]	Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance - at Dec. 31, 2012	$ 254	$ 100,412	$ 213,046	$ (29,467)	$ 284,245
Net income			8,372		8,372
Issuance of 217,879 shares of common stock pursuant to stock options and deferred stock units	2	4,957			4,959
Stock-based compensation expense		3,155			3,155
Issuance of 3,776 deferred stock units relating to prior year compensation		135			135
Balance - at Mar. 31, 2013	$ 256	$ 108,659	$ 221,418	$ (29,467)	$ 300,866