Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
United States	$ 192,219	$ 248,357	[1]	$ 241,470
Foreign	118,860	114,343	[1]	98,923
Earnings from continuing operations before income taxes	311,079	362,700	[1]	340,393
Current tax expense:
Federal	62,858	79,551		75,698
State	9,262	16,511		10,621
Foreign	24,452	32,883		24,931
Current income tax expense (benefit)	96,572	128,945		111,250
Deferred tax expense (benefit):
Federal	(5,185)	(10,183)		1,744
State	(993)	(1,571)		92
Foreign	(1,967)	(2,865)		(2,906)
Deferred income tax expense (benefit)	(8,145)	(14,619)		(1,070)
Total provision	$ 88,427	$ 114,326	[1]	$ 110,180

[1] Amounts have been adjusted for the reclassification of certain discontinued operations to continuing operations.