Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2011	$ 425	$ 345,619		$ 13,659	$ 359,703
Balance, shares at Dec. 31, 2011	42,530,809
Issuances of restricted stock	10	(10)
Issuances of restricted stock, shares	969,223
Amortization of share-based compensation		2,173			2,173
Purchase of treasury stock			(3,283)		(3,283)
Exercise of stock options / vesting of restricted stock		70			70
Exercise of stock options / vesting of restricted stock, shares
Net income				19,631	19,631
Balance at Mar. 31, 2012	$ 435	$ 347,852	$ (3,283)	$ 33,290	$ 378,294
Balance, shares at Mar. 31, 2012	43,500,032