Other Balance Sheet Items Other balance sheet items (Other long-term assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other Balance Sheet Items [Abstract]
Income Taxes Receivable, Noncurrent	$ 5,811	$ 5,811
Long-term Investments	413	413
Deferred Finance Costs, Noncurrent, Net	644	11,516
Restricted Cash and Cash Equivalents, Noncurrent	7,935	4,509
Security Deposit	2,608	3,076
Other Assets, Noncurrent	$ 17,411	$ 25,325