Property and Equipment, Net - Depreciation Expense Table (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Depreciation Expense [Line Items]
Depreciation expense			$ 12,690	$ 12,620
Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	6,240	5,830	12,690	11,510
Cost of Sales [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	5,380	5,100	11,020	10,050
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 860	$ 730	$ 1,670	$ 1,460