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, 2011	$ 248	$ 84,389	$ 222,126	$ (29,467)	$ 277,296
Net income			11,116		11,116
Issuance of 130,812 shares of common stock pursuant to stock options and deferred stock units	2	900			902
Income tax benefit relating to issuance of common stock pursuant to stock options and deferred stock units		72			72
Stock-based compensation expense		1,319			1,319
Issuance of 7,548 deferred stock units relating to prior year compensation		200			200
Balance - at Mar. 31, 2012	$ 250	$ 86,880	$ 233,242	$ (29,467)	$ 290,905