Income Taxes (Components of the Provision for Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Components of the provision for income taxes [Abstract]
Current tax provision, Federal	$ 50,022	$ 69,540	$ 25,065
Current tax provision, Foreign	29,169	25,467	21,747
Current tax provision, State	11,905	9,048	6,913
Total current tax provision	91,096	104,055	53,725
Deferred	(16,229)	(46,676)	(50,850)
Total provision for income taxes	$ 74,867	$ 57,379	$ 2,875