Stock-Based Compensation (Schedule of Stock-Based Compensation Expense and Realized Excess Tax Benefits) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Selling and administrative expenses	$ 105,009	$ 91,745	$ 201,030	$ 179,439
Income (loss) before income taxes	94,959	50,527	177,397	92,510
Provision for income taxes	(27,263)	(12,603)	(49,802)	(22,333)
Net income	67,696	37,924	127,595	70,177
Net cash provided by operating activities			114,504	67,617
Net cash used in financing activities			(132,456)	(46,705)
Stock-Based Compensation [Member]
Selling and administrative expenses	1,928	1,165	4,262	3,022
Total stock-based compensation expense included in operating expenses	1,928	1,165	4,262	3,022
Income (loss) before income taxes	(1,928)	(1,165)	(4,262)	(3,022)
Provision for income taxes	573	357	1,232	964
Net income	(1,355)	(808)	(3,030)	(2,058)
Net cash provided by operating activities	(724)	(414)	(2,237)	(1,903)
Net cash used in financing activities	$ 724	$ 414	$ 2,237	$ 1,903