Condensed Consolidated Statement Of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Stock
Balance at Dec. 31, 2013	$ 313,613	$ 261	$ 126,360	$ 216,459	$ (29,467)
Net income	16,164			16,164
Issuance of 218,795 shares of common stock pursuant to stock options and deferred stock units	1,333	2	1,331
Income tax benefit relating to issuance of common stock pursuant to stock options and deferred stock units	1,987		1,987
Stock-based compensation expense	2,625		2,625
Issuance of 43,188 deferred stock units relating to prior year compensation	1,986		1,986
Dividend equivalents on deferred stock units, stock awards and restricted stock			1,811	(1,811)
Balance at Mar. 31, 2014	$ 337,708	$ 263	$ 136,100	$ 230,812	$ (29,467)