Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings from continuing operations before income taxes:
United States	$ 241,672	$ 223,209	$ 156,123
Foreign	61,445	56,178	30,182
Earnings from continuing operations before income taxes	303,117	279,387	186,305
Current tax expense (benefit) from continuing operations:
Federal	(4,157)	1,615	4,536
State	11,514	7,785	4,468
Foreign	7,759	8,603	11,596
Total current tax expense (benefit) from continuing operations	15,116	18,003	20,600
Deferred tax expense (benefit) from continuing operations:
Federal	77,819	67,849	38,179
State	3,871	17,247	7,198
Foreign	5,412	4,920	(4,280)
Total Deferred tax expense (benefit) from continuing operations	87,102	90,016	41,097
Provision for income taxes from continuing operations	$ 102,218	$ 108,019	$ 61,697