Income Taxes (Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns [Abstract]
Balance at January 1	$ 132,211	$ 120,124	$ 108,592
Increases related to prior year tax positions	1,220	339	8,855
Decreases related to prior year tax positions	(24,745)	(1,933)	(1,969)
Decrease as a result of statute expirations	(1,629)	(1,886)	(3,178)
Decrease as a result of tax settlements	(7,606)	(5,207)	(4,887)
Increases related to current year tax positions	15,842	20,774	12,711
Balance at December 31	$ 115,293	$ 132,211	$ 120,124