Income Taxes (Uncertain Positions) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Increase in unrecognized tax benefits from current period tax position		$ 24,600
[DomesticCountryMember]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Increase in unrecognized tax benefits from current period tax position	29,100		(2,200)
[GB]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at the beginning of the year	0	0	0
Increase in unrecognized tax benefits from current period tax position	6,820	0	0
Balance at the end of the year	$ 6,820	$ 0	$ 0