Business and Significant Accounting Policies (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business and Significant Accounting Policies
Net loss	$ (139,881)	$ (46,140)	$ (66,065)
Net loss per share-basic and diluted (in dollars per share)	$ (1.42)	$ (0.55)	$ (0.82)
Shares used in the computation of net loss per share-basic and diluted	98,289,000	84,392,000	81,017,000
Continuing operations
Anti-dilutive Securities
Effect of dilutive securities (in shares)	4,172,000	5,357,000	4,384,000