CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Common Stock Member	Additional Paid In Capital Member	Retained Earnings Member	Accumulated Other Comprehensive Loss Member	Treasury Stock Member
Beginning Balance at Dec. 31, 2011		$ 48,879	$ 143,192	$ 1,163,925	$ (65,131)	$ (85,890)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings				113,844
Other comprehensive income, net of tax	9,623				9,623
Dividends paid/declared				(16,392)
Stock options exercised, net of tax		311	6,431			10,077
Restricted stock			(6,233)			6,233
Share-based compensation			8,907			521
Repurchases of common stock						(25,705)
Other			(414)			414
Ending Balance at Dec. 31, 2012	1,312,592	49,190	151,883	1,261,377	(55,508)	(94,350)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	54,313			54,313
Other comprehensive income, net of tax	13,901				13,901
Dividends paid/declared				(8,900)
Stock options exercised, net of tax		151	3,299			5,350
Restricted stock			(3,028)			3,028
Share-based compensation			2,775			407
Other			(330)			330
Ending Balance at Jun. 30, 2013	$ 1,383,888	$ 49,341	$ 154,599	$ 1,306,790	$ (41,607)	$ (85,235)