Property and Equipment, Net - Depreciation Expense Table (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Depreciation Expense [Line Items]
Depreciation expense			$ 18,990	$ 19,160
Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	6,300	5,990	18,990	17,500
Cost of Sales [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	5,400	5,260	16,420	15,300
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 900	$ 730	$ 2,570	$ 2,200