Income Taxes (Components of the Provision for Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 81,019	$ 50,022	$ 69,540
Foreign	30,059	29,169	25,467
State	17,395	11,905	9,048
Total current	128,473	91,096	104,055
Deferred:
Federal	(64,960)	(8,631)	(20,476)
Foreign	1,409	(4,792)	(5,349)
State	(7,240)	(2,806)	(20,851)
Total deferred	(70,791)	(16,229)	(46,676)
Total provision	$ 57,682	$ 74,867	$ 57,379