CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Beginning Balance at Dec. 31, 2010	$ 553,599	$ 873	$ 183,524	$ 740,923	$ (63,026)	$ (308,695)
Beginning Balance (in shares) at Dec. 31, 2010		69,876,000
Net income	26,112			26,112
Other comprehensive income	15,822				15,822
Dividends declared on common stock	(7,798)			(7,798)
Stock compensation expense	3,204		3,204
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,652 in 2011 and $829 in 2012 (in shares)		210,000
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,652 in 2011 and $829 in 2012	(3,167)		(614)			(2,553)
Ending Balance at Mar. 31, 2011	587,772	873	186,114	759,237	(47,204)	(311,248)
Ending Balance (in shares) at Mar. 31, 2011		70,086,000
Beginning Balance at Dec. 31, 2011	657,994	875	196,626	902,987	(115,282)	(327,212)
Beginning Balance (in shares) at Dec. 31, 2011		69,884,000
Net income	32,750			32,750
Other comprehensive income	15,394				15,394
Dividends declared on common stock	(8,487)			(8,487)
Stock compensation expense	1,727		1,727
Stock option exercises, including tax benefit of $485 (in shares)		30,000
Stock option exercises, including tax benefit of $485	640	1	639
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,652 in 2011 and $829 in 2012 (in shares)		74,000
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,652 in 2011 and $829 in 2012	(863)		76			(939)
Repurchases of common stock (in shares)	(114,199)	(114,000)
Repurchases of common stock	(5,015)					(5,015)
Ending Balance at Mar. 31, 2012	$ 694,140	$ 876	$ 199,068	$ 927,250	$ (99,888)	$ (333,166)
Ending Balance (in shares) at Mar. 31, 2012		69,874,000