Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income (loss)	$ 30,032	$ 11,177	$ (33,261)
Impact of impairment of investments charge, before tax	0	0	2,672
Income tax benefit related to impairment of investments	0	0	(979)
Other comprehensive income, net of tax	0	0	1,693
Comprehensive Income (Loss)	$ 30,032	$ 11,177	$ (31,568)