Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2011	$ 396,789	$ 234	$ (75,735)	$ 400,597	$ 72,902	$ (1,209)
Beginning Balance, shares at Dec. 31, 2011		23,362,828	(1,679,033)
Comprehensive income	17,848				17,826	22
Issuance of common stock in connection with:
Restricted stock awards, net of cancellations		4	(2,568)	2,564
Restricted stock awards, net of cancellations, shares		405,870	(62,147)
Exercise of stock options	29			29
Exercise of stock options, shares		22,808
Share-based compensation	12,353			12,353
Shares withheld for employee tax withholdings	(3,874)		(3,874)
Shares withheld for employee tax withholdings, shares			(101,839)
Income tax benefit on share-based compensation	709			709
Ending Balance at Sep. 30, 2012	$ 423,854	$ 238	$ (82,177)	$ 416,252	$ 90,728	$ (1,187)
Ending Balance, shares at Sep. 30, 2012		23,791,506	(1,843,019)