Income Taxes (Effective Tax Rate) (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Effective Tax Rate Disclosure [Line Items]
Federal income tax expense (benefit) at statutory rate	$ (39,199)	$ (36,378)	$ 19,500
Taxation of foreign operations	5,859	3,254	(579)
Tax-free gain on sale of reserves in place	0	0	(30,510)
Deemed foreign dividend of wholly owned subsidiaries	0	8,572	11,466
Disallowed executive compensation	1,655	1,585	765
Other	0	0	872
Total Income Tax Expense (Benefit)	14,228	27,061	(788)
Effective Income Tax Rate	(13.00%)	(26.00%)	(1.00%)
[GB]
Effective Tax Rate Disclosure [Line Items]
Effect of prior period adjustment	6,997	0	0
Foreign currency (gain) loss on deferred taxes	0	0	(50)
Total Income Tax Expense (Benefit)	14,202	27,042	346
[DomesticCountryMember]
Effective Tax Rate Disclosure [Line Items]
Change in valuation allowance - U.S.	30,329	24,604	(2,252)
Total Income Tax Expense (Benefit)	0	4	0
[ForeignCountryMember]
Effective Tax Rate Disclosure [Line Items]
U.K. Tax Increase from tax law and rate change	8,587	25,424	0
Total Income Tax Expense (Benefit)	$ 26	$ 15	$ (1,134)