Segment and Geographic Information (Details) (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
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 97,615	$ 83,275	$ 23,003	$ 15,166	$ 16,632	$ 10,302	$ 19,053	$ 14,104	$ 219,058	$ 60,091	$ 71,675
[DomesticCountryMember]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									11,877	18,337	11,174
Long-Lived Assets	123,977				139,236				123,977	139,236	115,114
[GB]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									207,181	41,754	60,501
Long-Lived Assets	1,189,870				650,943				1,189,870	650,943	486,467
[ForeignCountryMember]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									0	0	0
Long-Lived Assets	2,264				1,287				2,264	1,287	877
[SegmentContinuingOperationsMember]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									219,058	60,091	71,675
Long-Lived Assets	1,316,111				791,466				1,316,111	791,466	602,458
[SegmentGeographicalGroupsOfCountriesGroupOneMember]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									207,181	41,754	60,501
Long-Lived Assets	$ 1,192,134				$ 652,230				$ 1,192,134	$ 652,230	$ 487,344