Certain Balance Sheet Components Depreciation Expense and Capitalized Interest (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Depreciation expense [Line Items]
Depreciation expense	$ 14,027	$ 15,019	$ 28,040	$ 30,333
Capitalized interest	$ 21	$ 0	$ 64	$ 0