Other Balance Sheet Items Other balance sheet items (Other long-term assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 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	11,870	11,516
Restricted Cash and Cash Equivalents, Noncurrent	7,730	4,509
Prepaid expenses and deposits	3,344	3,076
Other Assets, Noncurrent	$ 29,168	$ 25,325