Summary Of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2011

Summary Of Significant Accounting Policies [Abstract]

Advertising Costs

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Advertising Costs	$	11,283	$	9,529	$	31,033	$	28,092

Components Of Comprehensive Income

	Three Months Ended September 30,					Nine Months Ended September 30,
	2011			2010		2011			2010
Net income	$	44,168		$	20,624	$	107,298		$	41,279
Translation adjustments		(14,611	)		16,523		(3,597	)		1,848
Total comprehensive income	$	29,557		$	37,147	$	103,701		$	43,127

Internal-Use Software

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Internal-use software development costs	$	5,717	$	3,052	$	13,710	$	7,013