Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components Of Income Tax Expense Benefit Continuing Operations Abstract
Federal current									$ 94,493	$ 47,993	$ 113,837
Federal deferred									20,827	21,075	(3,218)
Total federal									115,320	69,068	110,619
State current									2,570	2,203	1,797
State deferred									2,997	2,489	1,891
Total state									5,567	4,692	3,688
Foreign current									34,678	28,543	31,691
Foreign deferred									6,025	(2,790)	317
Total foreign									40,703	25,753	32,008
Uncertain Tax Positions Gross									1,597	250	(1,584)
Income tax expense	$ 41,428	$ 46,557	$ 40,826	$ 34,376	$ 34,092	$ 22,355	$ 27,427	$ 15,889	$ 163,187	$ 99,763	$ 144,731