CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	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	77,320			77,320
Other comprehensive income	18,108				18,108
Dividends declared on common stock	(15,600)			(15,600)
Stock compensation expense	4,742		4,742
Stock option exercises, including tax benefit of $679 in 2011 and $580 in 2012 (in shares)		46,000
Stock option exercises, including tax benefit of $679 in 2011 and $580 in 2012	1,073		1,073
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,700 in 2011 and $ 843 in 2012 (in shares)		216,000
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,700 in 2011 and $ 843 in 2012	(3,119)		(613)			(2,506)
Ending Balance at Jun. 30, 2011	636,123	873	188,726	802,643	(44,918)	(311,201)
Ending Balance (in shares) at Jun. 30, 2011		70,138,000
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	43,330			43,330
Other comprehensive income	(6,196)				(6,196)
Dividends declared on common stock	(16,947)			(16,947)
Stock compensation expense	3,479		3,479
Stock option exercises, including tax benefit of $679 in 2011 and $580 in 2012 (in shares)		36,000
Stock option exercises, including tax benefit of $679 in 2011 and $580 in 2012	775	1	774
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,700 in 2011 and $ 843 in 2012 (in shares)		81,000
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,700 in 2011 and $ 843 in 2012	(849)		45			(894)
Repurchases of common stock (in shares)	(510,878)	(511,000)
Repurchases of common stock	(22,086)					(22,086)
Ending Balance at Jun. 30, 2012	$ 659,500	$ 876	$ 200,924	$ 929,370	$ (121,478)	$ (350,192)
Ending Balance (in shares) at Jun. 30, 2012		69,490,000