Discontinued Operations (Schedule Of Revenue And Income For The Discontinued Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Discontinued Operations [Abstract]
Revenue									$ 620,994	$ 314,461	$ 212,375
Income before income taxes									230,380	194,729	138,247
Provision for income taxes									(82,118)	(74,666)	(52,898)
Net income									148,262	120,063	85,349
Net (income) loss attributable to noncontrolling interest									(114)	(178)	212
Net income attributable to discontinued operations	$ 10,633	$ 38,566	$ 52,757	$ 46,306	$ 7,999	$ 41,354	$ 37,022	$ 33,688	$ 148,148	$ 119,885	$ 85,561
Basic per share									$ 1.09	$ 0.85	$ 0.59
Diluted per share									$ 1.07	$ 0.83	$ 0.59
Basic									135,888	141,233	144,107
Diluted									138,702	144,014	146,071