Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Income (Loss) Attributable to Parent	$ (451,468)	$ 302,150	$ (1,805,867)
Foreign currency translation adjustments:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(7)	6,265	3,328
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	0	27,305	519
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(7)	(21,040)	2,809
Unrealized gains (losses) on investments:
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	14,132	7,400	41,164
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	9,272	(31,928)	(3,781)
Net unrealized gain on investments, net of tax	4,860	39,328	44,945
Other Comprehensive Income (Loss), Net of Tax	4,853	18,288	47,754
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (446,615)	$ 320,438	$ (1,758,113)