Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Operations and Comprehensive Income (Loss) [Abstract]
Equity in loss of investments	$ 21,058	$ 0	$ 36,356